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A 57.6 g sample of methane (CH4) is found to contain 43.2 g of carbon. What is the
percent composition of Carbon and Hydrogen? How much hydrogen (in grams) would a
37.8 g sample of methane contain?

Answer :

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Answer:

Explanation:

  • The atomic mass of carbon is 12.011 g/mol.
  • The atomic mass of hydrogen is 1.00794 g/mol.

This means that the atomic mass of methane is 12.011+4(1.00794)=16.04276 g/mol.

  • The percent composition by mass of carbon is [tex]\frac{12.011}{16.04276} \times 100=\boxed{74.9\%}[/tex]
  • The percent composition by mass of hydrogen is [tex]\frac{4(1.00794)}{16.04276} \times 100=\boxed{25.1\%}[/tex]

This means that in a 37.8-gram sample of methane, there would be [tex](37.8)\left(\frac{25.1}{100} \right)=\boxed{9.49}[/tex] grams of hydrogen.

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