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Example Questions
Example Question #21 : Sat Subject Test In Chemistry
What is the approximate percentage of carbon by mass in heptane, which has the molecular formula ?
Possible Answers:
Correct answer:
Explanation:
First, calculate the molar mass of heptane, which is
We can calculate the percentage of carbon by mass in heptane by creating a fraction of the mass of carbon over the mass of the entire molecule and converting it into a percentage:
For every 100 g of heptane, 84 g must come from carbon. This means that the percentage of carbon by mass is
Gregory
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