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General Chemistry

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Matter

Question
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The following reactions were conducted in a lab for studies related to reaction kinetics. Consider the reactions shown below:


Which of the following equals the number of hydrogen atoms in 40 grams of methane?

A 1.5 x 1024
B 2.4 x 1024
C 6.0 x 1024
D 6.023 x 1023
Ans. C The formula of methane is CH4. The molecular weight is 16 g/mol. We have 40 g of methane. That means we have 2.5 moles of methane. So the number of hydrogen atoms can be calculated.

6.0 x 1023 x 2.5 moles x 4 hydrogen atoms/mol = 6.0 x 1024 atoms

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