What amount of oxygen, O2, (in moles) contains 1.81022 molecules? how many hydrogen atoms in 25.0 grams of water. .ec_product_quickview_content_quantity .ec_minus, .ec_product_quickview_content_quantity .ec_plus{ background-color:#222222; } {color:#757575;}ul.footer_links a,ul.footer_links The molar mass of any substance is its atomic mass, molecular mass, or formula mass in grams per mole. .ec_cart_right > .ec_cart_header.ec_top{ margin-top:15px; } The definition of a molethat is, the decision to base it on 12 g of carbon-12is arbitrary but one arrived at after some discussion between chemists and physicists debating about whether to use naturally occurring carbon, a mixture of C-12 and C-13, or hydrogen. " Thank you for taking the time to develop a course that will improve the quality of my life. ", }); molar mass and molecular weight. " Since attending Mr. Rose\'s class, I\'ve been able to streamline my sales process and improve my ability to quickly earn key accounts. He makes the course easy to understand and gives positive attitude. ", How many hydrogen atoms are in one mole of methane? .ec_cart > thead > tr{ border-bottom-color:#222222; } As you learned, the mass number is the sum of the numbers of protons and neutrons present in the nucleus of an atom. The percentage by mass of the elements in a compound is C = 72%, H = 12%, O = 16%. .ec_price_container_type5:after{ border-color: #666666 transparent transparent #666666; } B Convert from moles to mass by multiplying the moles of the compound given by its molar mass. .ec_show_two_column_only{ display:none !important; } " Gave a lot of insight on things we dont really think about improving and should. ", 1 g of CH3Cl C. 1 g of CHCl3 B. Determine the number of CH 2 Cl 2 molecules in 25.1 g CH 2 Cl 2. .ec_product_star_on:after{ color:#222222; border-bottom-color:#222222; } how many hydrogen atoms in 32.0 grams of CH4. " Best workshop/course Ive been on! ", Thus, the 1 molecule of CHCl contains 2 hydrogen atoms so for 5 molecules of CHCl there will be 10 hydrogen atoms. The mole concept, which we will introduce here, bridges that gap by relating the mass of a single atom or molecule in amu to the mass of a collection of a large number of such molecules in grams. .ec_cart_right > .ec_cart_header.ec_top{ margin-top:15px; } 1 mole * 6.022e23 molecules/ mole * 4 H atoms / molecule = .ec_cart_right > .ec_cart_header.ec_top{ margin-top:15px; } 0.5 mol MgCl2 ul.ec_menu_vertical ul li a:hover, ul.ec_menu_vertical ul ul li a:hover, .ec_categorywidget a:hover, .ec_manufacturerwidget a:hover, .ec_pricepointwidget a:hover, .ec_groupwidget a:hover, .ec_product_widget_title a:hover{ color:#222222 !important; } The molar mass is defined as the mass in grams of 1 mol of that substance. (, The relative molecular mass (Mr) of a compound is 60. .ec_product_details_star_on:before{ border-bottom-color:#222222; } 23. atoms H / 1.0000 g H. Answer 2: Because the molecular mass of Hydrogen is 1 gram/mole, there is 1 mole of hydrogen in 1 gram of hydrogen atoms. .ec_details_description{ color:#222222 !important; } Haloalkanes or alkyl halides are organic compounds, which contain at least one halogen atom bonded to the carbon atom. Is the singer Avant and R Kelly brothers? In this case, the periodic table tells us there is 1g of hydrogen per mole. How can I know how many moles are in 4.0 grams of Hydrogen gas(H 2)? The concept of the mole allows us to count a specific number of individual atoms and molecules by weighing measurable quantities of elements and compounds. 5 C. 1.01023 B. What is the molarity of sodium ions in a solution prepared by diluting 250. mL of 0.550 M Na2SO4 to 1.25 L? that "stuff" and it can be thought of in terms of the "reaction Finding molar mass starts with units of grams per mole (g/mol). 2.0 dm3 " Was a good pace, interesting, fun and seemed to fly by quickly. ", #ec_cart_payment_hide_column{ display:none; } .ec_category_li:nth-child( 2n+1 ){ clear:both; } " You can see the passion in Norman\'s work, his belief in his programs makes it easy to follow and the info is delivered in a fun and easy to learn manner. ", .ec_category_li{ width:100%; } a mole of anything has 6.022 x 1023 "units" of that stuff. .ec_details_customer_reviews_row > input[type="button"]{ background-color:#333; color:#FFFFFF; } WebQC is a web application with a mission to provide best-in-class chemistry tools and information to chemists and students. So. This relation is then used to 'convert' a number of H 2 O molecules to grams by the ratio: mass of X molecules of H 2 O / X molecules = mass of a mole of H 2 O molecules / 6.022 x 10 23 molecules. Figure 1.7.2 is a flowchart for converting between mass; the number of moles; and the number of atoms, molecules, or formula units. Using the concept of the mole, we can now restate Daltons theory: 1 mol of a compound is formed by combining elements in amounts whose mole ratios are small whole numbers. #ec_cart_payment_one_column{ display:block; } This solution is. quotesInit: function(){ (a.addEventListener("DOMContentLoaded",n,!1),e.addEventListener("load",n,!1)):(e.attachEvent("onload",n),a.attachEvent("onreadystatechange",function(){"complete"===a.readyState&&t.readyCallback()})),(r=t.source||{}).concatemoji?d(r.concatemoji):r.wpemoji&&r.twemoji&&(d(r.twemoji),d(r.wpemoji)))}(window,document,window._wpemojiSettings); {color:#141414;}#footer " One of the best Ive been to, if not the best! ", .ec_product_quickview_content_data{ padding:15px; } .ec_categorywidget a:hover, .ec_manufacturer_widget a:hover, .ec_pricepoint_widget a:hover, .ec_group_widget a:hover, .ec_cartwidget a:hover{ color:#666666 !important; } " I feel like my motivation to do the best I can has been re-established. ", " Not only has it helped my confidence, it has given me a plan that I can use every day. ", ], See Answer Question: 1. The molar mass of a substance is defined as the mass of 1 mol of that substance, expressed in grams per mole, and is equal to the mass of 6.022 1023 atoms, molecules, or formula units of that substance. Since each sulfuric acid molecule contains 4 oxygen atoms, there are about 20 moles of sulfuric acid molecules. So it is: $$8.66 \cdot 6.02 \cdot 10^{23} = 5.21332 \cdot 10^{24}$$ Can you give me the answers. .ec_cart_widget_minicart_wrap{ background:#222222; } .ec_details_right > form > .ec_details_breadcrumbs.ec_small, .ec_details_right > form > .ec_details_title, .ec_details_right > form > .ec_title_divider, .ec_details_right > form > .ec_details_price, .ec_details_right > form > .ec_details_rating{ display:none; } Ace Combat 7 Mrp Glitch, Find moles atoms & grams of an element in a compound 0.0884mol C4H10 C: (4) x 0.0884 = 0.3536 H: (10) x 0.0884 = 0.884 . .ec_product_quickview_content_quantity input[type="submit"], .ec_product_quickview_content_quantity input[type="button"], .ec_product_quickview_content_add_to_cart a{ background-color:#222222 !important; } .ec_product_details_star_on:after{ color:#222222; border-bottom-color:#222222; } .ec_category_li:nth-child( 2n+1 ) .ec_product_editor{ left:227px; } The best sales training I have been provided. ", Now number of moles of CH 4 in 5.2 1024 molecules is = 5.2 1024 Avogadro's number So the number of moles of H atom in it = 4 5.2 1024 Avogadro's number .ec_cart_success_continue_shopping_button > a{ background:#222222 !important; } Ace Combat 7 Mrp Glitch, If a mole of pennies were distributed equally among the entire population on Earth, each person would get more than one trillion dollars. blockquote.testimonial p, The LibreTexts libraries arePowered by NICE CXone Expertand are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. The H2 in H2O is not 2 hydrogens bonded to one another and then to oxygen, but two separate hydrogen atoms, each bonded an oxygen atom. .ec_cartitem_quantity_table > tbody > tr > td > .ec_minus:hover, .ec_cartitem_quantity_table > tbody > tr > td > .ec_plus:hover, .ec_cartitem_quantity_table > tbody > tr > td > .ec_cartitem_update_button:hover{ background-color:#666666 !important; } Convert grams CH2Cl2 to moles or moles CH2Cl2 to grams. so there are 4 x 6.022 x 10^23 H atoms = 24.088 x 10^23. \[4.89 \times 10^{25} \: \text{atoms} \: \ce{O} \times \frac{1 \: \text{molecule} \: \ce{H_2SO_4}}{4 \: \text{atoms} \: \ce{O}} \times \frac{1 \: \text{mol} \: \ce{H_2SO_4}}{6.02 \times 10^{23} \: \text{molecules} \: \ce{H_2SO_4}} = 20.3 \: \text{mol} \: \ce{H_2SO_4}\nonumber \]. One mole of it will contain 6.02x1023 representative particles (that's Avogadro's number.) C. 100 cm3 of 1.0 mol dm-3 NaOH For example, 1 mol of water (H2O) has 2 mol of hydrogen atoms and 1 mol of oxygen atoms. CH2Cl2 molecular weight Molar mass of CH2Cl2 = 84.93258 g/mol This compound is also known as Methylene Chloride or Dichloromethane. Trick question. will be (6.022 x 1023 times 2) atoms of hydrogen which will be 2) What is the formula mass of cobalt(II) acetate tetrahydrate? D. I, II and III .ec_product_added_to_cart a:hover, .ec_cart_checkout_link:hover{ color:#666666 !important; } Clearly, the mole is so large that it is useful only for measuring very small objects, such as atoms. The expression 2H, on the other hand, indicates two separate hydrogen atoms that are not combined as a unit. .ec_category_li{ width:100%; } A. width: 1em !important; " A great guide to sales but also a great guide to how to live your life. Therefore, in a mole of methane molecules, there are 2.4088 x .ec_product_type3 .ec_product_addtocart:hover{ background-color:#666666 !important; } If it takes about 3 years for light to travel from a certain star toEarth . .ec_details_right{ width:53%; margin-left:47%; } Now the mass of hydrogen = 1 gram mass of chlorine = 35.5 grams Therefore, molar mass of CH2Cl2 = 12 + 2 (1) + 2 (35.5) = 85 grams number of moles = mass / molar mass number of moles of CH2Cl2 = 66.05 / 85 = 0.777 moles One mole of CH2Cl2 contains two moles of Cl and each chlorine mole has Avogadro's number of atoms in it. ul.ec_menu_vertical li a:hover{ background-color:#222222; } .ec_details_customer_reviews_row{ color:#222222; } C63H88CoN14O14P. A. B. Not Sure About the Answer? Who is the longest reigning WWE Champion of all time? representative particles (that's Avogadro's number.) " Norm was fantastic, energized, friendly, funny and informative. How Did James Hunt Die, NH Carbons: [Select] Hydrogens: [Select] Lone Pairs: [Select] Question. . I am refreshed and ready to make changes. ", There are 2 hydrogen atoms in the molecule so that will be twice the constant 1.2044283 x 10^24 atoms. To appreciate the magnitude of Avogadros number, consider a mole of pennies. Metal Framing Jobs Near Me, At t=0, an automobile traveling north begins to make a turn. 1 mole of H2 = 6.02 10^23 molecules 5 mole of H2 = 5 6.02 10^23 molecules Number of molecules = 30.1 10^23 Notice:) One H2 molecule = 2 H atoms (asked in Que.) " [Norm was] well prepared, lively, funny, entertaining. ", .ec_product_type6 .ec_product_meta_type6 .ec_product_addtocart_container{ float:none; } The calculated answer (0.5639 mol) is indeed less than 1 mol, so we have probably not made a major error in the calculations. 20.0 cm3 of 0.400 mol dm-3 NaCl It will keep me on track and make me plan better. ", .ec_details_images{ width:47%; } For every mole, there are 6.02*10 23 atoms, so in 1 gram of hydrogen there are 6.02*10 23 hydrogen atoms (in scientific notation . For every molecule of C12H22O11, there are 12 carbon atoms, aka 1:12. As you calculated in Example 1, the molecular mass of ethanol is 46.069 amu. 1.0 dm3 $('#comments').css('display', 'none'); Follow along and record the measurements to get the relative masses. in1.25 moles 1.25*6.022*10^23 molecules. box-shadow: none !important; How many moles of sulfuric acid is the sample? Convert grams C6H6 to moles or moles C6H6 to grams Molecular weight calculation: 12.0107*6 + 1.00794*6 Percent composition by element Calculate the molecular weight of a chemical compound Enter a chemical formula: Trick question. CH3CH2CH2OH $('document').ready(function() { How Did James Hunt Die, C Convert from moles to molecules by multiplying the number of moles by Avogadros number. " Norm is an excellent facilitator. In that case, a dozen is 12; so 12 2 = 24 hydrogen atoms in a dozen water molecules. Among its many uses, ethanol is a fuel for internal combustion engines. Norm breaks it down and makes the possibilities endless. ", Inside Sales and Customer Service Training, how many hydrogen atoms are in one mole of ch2cl2. CH2Cl2 molecular weight. .ec_image_container_none, .ec_image_container_none > div, .ec_image_container_border, .ec_image_container_border > div, .ec_image_container_shadow, .ec_image_container_shadow > div{ min-height:380px; height:380px; } .ec_details_tab.ec_active{ border-top-color:#222222; } 1 : 2 C. 1 : 6 D. 6 : 1. generally true of all gases except the inert gases. atoms. .ec_cart_input_row > a, .ec_cart_input_row > b, .ec_cart_input_row > strong, .ec_account_order_details_item_display_title > a{ color:#222222; } How many atoms are in one mole of hydrogen? for O2? Ge Microwave Door Button Broken, " This course not only assists in day to day practices but everyday life. jQuery(document).ready(function(jQuery){jQuery.datepicker.setDefaults({"closeText":"Close","currentText":"Today","monthNames":["January","February","March","April","May","June","July","August","September","October","November","December"],"monthNamesShort":["Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"],"nextText":"Next","prevText":"Previous","dayNames":["Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"],"dayNamesShort":["Sun","Mon","Tue","Wed","Thu","Fri","Sat"],"dayNamesMin":["S","M","T","W","T","F","S"],"dateFormat":"MM d, yy","firstDay":1,"isRTL":false});}); Trick question. .ec_category_li:nth-child( 1n+1 ){ clear:both; } A mole of hydrogen is 6.022 x 1023 units of Since the mass of the gas can also be measured on a sensitive balance . The molecular mass The sum of the average masses of the atoms in one molecule of a substance, each multiplied by its subscript. .ec_image_container_none, .ec_image_container_none > div, .ec_image_container_border, .ec_image_container_border > div, .ec_image_container_shadow, .ec_image_container_shadow > div{ min-height:310px; height:310px; } #ec_current_media_size{ max-width:989px; } How many moles of carbon atoms is \(4.72 \times 10^{24}\) atoms of carbon? D. 40.0 cm3 of 0.200 mol dm-3 NaCl A mole of C-12 by definition weighs exactly 12 g and Avogadro's number is determined by counting the number of atoms. A sample of a hydrocarbon (a compound consisting of only carbon and hydrogen) contains 2.59 1023 atoms of hydrogen and is 17.3% hydrogen by mass. number of atoms in 1g of hydrogen, or 12g of carbon, or 23g of sodium. $('#attachments').css('display', 'none'); To analyze the transformations that occur between individual atoms or molecules in a chemical reaction it is therefore absolutely essential for chemists to know how many atoms or molecules are contained in a measurable quantity in the laboratorya given mass of sample. .ec_category_li:nth-child( 2n+1 ){ clear:both; } " Very informative, not just a re-hash of other sales systems. ", The element carbon exists in two primary forms: graphite and diamond. .ec_cart_breadcrumb.ec_inactive, .ec_cart_breadcrumb_divider{ display:none; } 1 : 2 C. 1 : 6 D. 6 : 1 B .ec_quickview_view_details a{ color:#222222 !important; } Explanation: First, the correct chemical formula of isopropyl alcohol is C3H 7OH and not C3H 7O. What amount (in moles) is present in 2.0 g of sodium hydroxide, NaOH? Since Avogadro's number is a measured quantity with three significant figures, the result of the calculation is rounded to three significant figures. span.price, generally true of all gases except the inert gases. The mole provides a bridge between the atomic world (amu) and the laboratory (grams). So, the number of Hydrogen atoms in 5 molecules of C3H 7OH will be 8 5 = 40. When we deal with elements such as iodine and sulfur, which occur as a diatomic molecule (I2) and a polyatomic molecule (S8), respectively, molar mass usually refers to the mass of 1 mol of atoms of the elementin this case I and S, not to the mass of 1 mol of molecules of the element (I2 and S8). A mole of nitrogen atoms is 14 grams and a mole of nitrogen molecules 28 grams, etc. .ec_quickview_view_details a:hover{ color:#666666 !important; } .author_info strong a, There are 4 Hydrogen atoms in one molecule of methane, or 2 Just as 1 mol of atoms contains 6.022 1023 atoms, 1 mol of eggs contains 6.022 1023 eggs. What is the mole ratio of C:H in the empirical formula of this compound? Because of the way in which the mole is defined, for every element the number of grams in a mole is the same as the number of atomic mass units in the atomic mass of the element. It will help me be a more efficient Manager and team leader. .ec_product_type3 .ec_product_addtocart:hover{ background-color:#222222; } It allows determination of the number of molecules or atoms by weighing them. .ec_details_customer_reviews_row > input[type="button"]:hover{ background-color:#333333; } Therefore, in a mole of methane molecules, there are 2.4088 x 1024. .ec_product_li:nth-child( 1n+1 ) .ec_product_editor{ left:227px; } } 10.0 cm3 of 0.500 mol dm-3 NaCl B Obtain the atomic masses of each element from the periodic table and multiply the atomic mass of each element by the number of atoms of that element. The sum of the average masses of the atoms in one molecule of a substance, each multiplied by its subscript. Atoms Mass percent; Carbon: C: 12.0107: 1: 14.1415: Hydrogen: H: 1.00794: 2: 2.3735: Chlorine: Cl: 35.453: 2: 83.4850 The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom (or group of atoms) in the formula by the formula weight and multiplying by 100. Methane is CH4. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. .ec_cartitem_title{ color:#222222 !important; } blockquote, To calculate the number of atoms, molecules or formula units in a sample. Cyanocobalamin is vitamin B-12, and its outrageous formula is C63H88CoN14O14P. 5 B. A certain quantity of sulfuric acid contains \(4.89 \times 10^{25}\) atoms of oxygen. .ec_details_model_number{ color:#666666 !important; } One conversion factor will allow us to convert from the number of \(\ce{C}\) atoms to moles of \(\ce{C}\) atoms. =2.4088 x 10^24 atoms of H. Advertisement. Using our unit conversion techniques, we can use the mole label to convert back and forth between the number of particles and moles. Sulfuric acid has the chemical formula \(\ce{H_2SO_4}\). We assume you are converting between grams CH2Cl2 and mole. A light year is the distance that light travels in a year. Therefore, in . } .blog_list .comment_quote p, Which has the greatest number of hydrogen atoms? The percentage by mass of the elements in a compound is C = 72%, H = 12%, O = 16%. Answer (1 of 4): (NH4+)2 HPO4[2-] 4 H atoms per NH4+ ion 2 NH4+ ions 8 H atoms total 1 H atom per HPO4[2-] ion +8 H atoms 9 H atoms total In one molecule there are 42 + 1 = 9. a.ec_cart_empty_button{ background-color:#222222 } The same calculation can also be done in a tabular format, which is especially helpful for more complex molecules: Calculate the molecular mass of trichlorofluoromethane, also known as Freon-11, whose condensed structural formula is CCl3F. blockquote.testimonial p span.author The molar mass of ethanol is the mass of ethanol (C2H5OH) that contains 6.022 1023 ethanol molecules. The "stuff" is the atoms or the molecules of How many atoms of hydrogen are there in 5 moles of H2 molecules? One mole is equal to 6.022 x 1023. .ec_details_add_to_cart_area > .ec_details_quantity > .ec_minus:hover, .ec_details_add_to_cart_area > .ec_details_quantity > .ec_plus:hover, .ec_details_add_to_cart_area > .ec_details_add_to_cart > input:hover, .ec_details_add_to_cart_area > .ec_details_add_to_cart > a:hover, .ec_details_customer_reviews_row > input[type="button"]:hover, .ec_details_inquiry_popup_main > form > .ec_details_add_to_cart > input:hover, .ec_details_inquiry_popup_main > form > .ec_details_add_to_cart > a:hover{ background-color:#666666 !important; } 1. This is analogous to the fact that a dozen extra large eggs weighs more than a dozen small eggs, or that the total weight of 50 adult humans is greater than the total weight of 50 children. .ec_product_star_on{ border-bottom-color:#222222 !important; color:#222222; border-bottom-color:#222222; } What is the mass in grams of 0.42 moles of Al2O3 ? 25.0 cm3 Avogadro's number.) When we consider the behavior of gases in Unit 5, we can use the data to calculate the molecular weight of each gas. D. 1.0 mol MgO C. II and III only " Presented in a way we could relate to. ", Methane is CH4. This method was, until the invention of the mass spectrometer, the best way of measuring molecular weights of gas molecules. } The given number of carbon atoms was greater than Avogadro's number, so the number of moles of \(\ce{C}\) atoms is greater than 1 mole. Before you use log you have to multiply the answer of $8.66~\mathrm{mol}$ by $6.02 \cdot 10^{23}$ by 3 because the answer of $8.66~\mathrm{mol}$ by $6.02 \cdot 10^{23}$ gives you the number of ammonia molecules and in each molecules there are 3 hydrogen atoms present. To calculate the molecular mass of a covalent compound. Similarly, the mass of 1 mol of helium (atomic mass = 4.002602 amu) is 4.002602 g, which is about one-third that of 1 mol of carbon-12. .ec_product_type3 .ec_product_quickview > input:hover{ background:#222222; background-color:#222222; } Therapy Dog Test, C. 1.0 mol Na2O Convert between CH2Cl2 weight and moles Elemental composition of CH2Cl2 Formula in Hill system is CH2Cl2 Computing molar mass (molar weight) .ec_product_li:nth-child( 1n+1 ) .ec_product_editor{ left:227px; } Which compound has the empirical formula with the greatest mass? Because the units of atomic mass are atomic mass units, the units of molecular mass are also atomic mass units. " I feel refreshed and reenergized to start implementing what Ive learned. ", B. 0.220 M. The solubility of K2Cr2O7 in water is 125 g/L at 20 C. Two conversion factors will be used. " Improved coaching ability - a standard to hold staff accountable to. ", bonding relationships to one another, in covalent compounds. " This course was about 90% applicable to my daily circumstances. 16. To avoid toomuch space, write your answer in scientific notation. " Being an outside sales rep -- will use the principles on an everyday basis. ", 0.050 C. 20 B. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. " The 7 steps was a great insight in dealing with clients. ", Alliteration In The Cask Of Amontillado, what is the mass of 3.2 moles of H2O. 92% (402 ratings) Problem Details. .ec_image_container_none, .ec_image_container_none > div, .ec_image_container_border, .ec_image_container_border > div, .ec_image_container_shadow, .ec_image_container_shadow > div{ min-height:310px; height:310px; } This compound is also known as Methylene Chloride or Dichloromethane. .ec_category_li{ width:50%; } Chemical bonds also hold potential energy. Carbon has four valence electrons, Hydrogen has one valence electrons and like all halogens, Chlorine has seven valence electrons. This is because the oxygen atom, in addition to forming bonds with the hydrogen atoms, also carries two pairs of unshared electrons. __ CH3CHO + __ O2 __ CO2 + __ H2O There are two moles of hydrogen atoms and one mole of oxygen atoms in one mole of water. .frame, .wp-caption, Based on the type or types of intermolecular forces, predict the substance in each pair that has the higher boiling point. } 2 The bond angles about the carbon atom in the formaldehyde molecule, H2C=O, are about: 120 degrees The molecular structure of IF4- is square planar T/F a Trigonal pyramid molecules (three identical bonds) always has a dipole moment T When a carbon atom has sp3 hybridization, it has (# of what type of bonds) four bonds .ec_category_li:nth-child( 2n+1 ) .ec_product_editor{ left:227px; } this.i = this.i % (this.numQuotes) + 1; How many atoms of hydrogen are in two water molecules?
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