anonymous
  • anonymous
1) A 64 u sample of a compound containing carbon and hydrogen is heated in the presence of oxygen. 144 u of water and 176 u of carbon dioxide are produced. The mass of the molecule is 16 u. Find the empirical and molecular formula. 2) A 17.471 g sample of a compound containing carbon, hydrogen, and oxygen is heated in the presence of oxygen. 10.477 g of water and 25.612 g of carbon dioxide are produced. The molar mass of the molecule is 90.079 g/mol. Find the empirical and molecular formula.
Chemistry
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anonymous
  • anonymous
1) A 64 u sample of a compound containing carbon and hydrogen is heated in the presence of oxygen. 144 u of water and 176 u of carbon dioxide are produced. The mass of the molecule is 16 u. Find the empirical and molecular formula. 2) A 17.471 g sample of a compound containing carbon, hydrogen, and oxygen is heated in the presence of oxygen. 10.477 g of water and 25.612 g of carbon dioxide are produced. The molar mass of the molecule is 90.079 g/mol. Find the empirical and molecular formula.
Chemistry
katieb
  • katieb
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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Preetha
  • Preetha
What have you done so far?
anonymous
  • anonymous
Honestly nothing because I have no idea what I'm doing....
Preetha
  • Preetha
First you calculate the moles of C present in CO2 and the moles of H in H2O

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anonymous
  • anonymous
CO2 = 3.9991365500592mol H2O = 7.993214648899199mol Are those right?
anonymous
  • anonymous
Would I round them?
Preetha
  • Preetha
Did you do 176 x 10-12 g x 1 mol CO2/44 g
anonymous
  • anonymous
I came out to 39.7272...
anonymous
  • anonymous
Wait-- I think I know what I'm doing now, but thank you!
Preetha
  • Preetha
Ok, in this problem you need to round it to 2 sig figs because you have the number 16 in the problem.

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