Review I Constants I Periodic Table Percent composition refers to the mass percent of each element in a compound: Part A mass of element V mass percent mass of compound X 100% A hydrocarbon is a compound that contains mostly carbon and hydrogen. Calculate the percent composition (by mass) of the following hydrocarbon: C8H18 For example, the percent composition of water, H2O, is 11.2% hydrogen and 88.8% oxygen. Therefore, a 100-g sample of water contains 11.2 g of hydrogen atoms and 88.8 g of oxygen atoms. Enter the percentages of carbon and hydrogen numerically to four significant figures, separated by commas. View Available Hint(s) The periodic table will be useful when doing this problem. You can access a periodic table by clicking the "Tools" link in the upper right corner of this page. α ΑΣφ ? |80,20 carbon, hydrogen = Previous Answers Submit X Incorrect; Try Again; 3 attempts remaining

Review I Constants I Periodic Table Percent composition refers to the mass percent of each element in a compound: Part A mass of element V mass percent mass of compound X 100% A hydrocarbon is a compound that contains mostly carbon and hydrogen. Calculate the percent composition (by mass) of the following hydrocarbon: C8H18 For example, the percent composition of water, H2O, is 11.2% hydrogen and 88.8% oxygen. Therefore, a 100-g sample of water contains 11.2 g of hydrogen atoms and 88.8 g of oxygen atoms. Enter the percentages of carbon and hydrogen numerically to four significant figures, separated by commas. View Available Hint(s) The periodic table will be useful when doing this problem. You can access a periodic table by clicking the "Tools" link in the upper right corner of this page. α ΑΣφ ? |80,20 carbon, hydrogen = Previous Answers Submit X Incorrect; Try Again; 3 attempts remaining

Introductory Chemistry: A Foundation

9th Edition

ISBN:9781337399425

Author:Steven S. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Donald J. DeCoste

Chapter8: Chemical Composition

Section: Chapter Questions

Problem 128CP: itamin B12 , cyancobalamin, is essential for human nutrition. Its molecular formula is...

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Calculate the mass in grams of each of the following samples. l type="a"> 0.994 mole of benzene, C6H6 i>4.21 moles of calcium hydride 1.79104 moles of hydrogen peroxide, H2O2 i>1.22 rnmol of glucose, C6H12O6(1mmol=11000mole) i>10.6 moles of tin 0.000301 moIe of strontium fluoride
itamin B12 , cyancobalamin, is essential for human nutrition. Its molecular formula is C63H88CoN14O14P . A lack of this vita min in the diet can lead to anemia. Cyanocohalamin is the form of the vitamin found in vitamin supplements. l type='a'> What is the molar mass of cyanocobalamin to two decimal places? How many moles of cyanocohalamin molecules are present in 250 mg of cyanocobalamin? What is the mass of 0.60 mole of cyanocobalamin? How many atoms of hydrogen are in 1 .0 mole of cyanocobalamin? What is the mass of 1.0107 molecules of cyanocobalamin? What is the mass (in grams) of one molecule of cyanocobalamin?
(a) Does the percent by mass of each element in a compounddepend on the amount of compound? Explain. (b) Does the massof each element in a compound depend on the amount of com-pound? Explain
If the lower pie chart was drawn asthe percentage in terms of number ofatoms rather than the percentage interms of mass, would the hydrogenslice of the pie get larger or smaller?
For the compound (Ca(OH)2) or calcium hydroxide, find theper cent composition of the element Calcium(Ca).
How many oxygen atoms are in 19 molecules of tetraphoshorus decoxide (aslo known as phosphorus pentoxide), P4O10?
A sample of glucose, C6H12O6, contains 1.250 * 1021 carbonatoms. (a) How many atoms of hydrogen does it contain?(b) How many molecules of glucose does it contain? (c) Howmany moles of glucose does it contain? (d) What is the massof this sample in grams?
Consider the mixture of propane, c3h8 and o2 a. What is the percent, by mass, of carbon in propane?
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A compound containing carbon and hydrogen has a molar mass of 56.11 g/mol and an emperical formula of CH2. What is the molecular formula for the compund?
The molecular formula of allicin, the compound responsiblefor the characteristic smell of garlic, is C6H10OS2. (a) Whatis the molar mass of allicin? (b) How many moles of allicinare present in 5.00 mg of this substance? (c) How many moleculesof allicin are in 5.00 mg of this substance? (d) Howmany S atoms are present in 5.00 mg of allicin?
A given compound contains 23.8% S, 23.7% O, and 52.5% Cl by mass. Which compound below is consistent with these values. A) SOCl B)SOCl2 C)S2O2Cl3 D)SO2Cl E)SO2Cl2