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SAT Chemistry

Category - Multiple Choice

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What is the percentage carbon by mass of glucose, C₆H₁₂O₆?

14.7 percent
40.0 percent
6.7 percent
19.2 percent
59.9 percent

Explanation

Answer: 40.0 percent

To find the percentage carbon by mass in glucose, divide the mass of carbon in the compound by the total mass of the compound. This calculation is written (72.07 amu) / (180.15 amu), and indicates that glucose is 40.0 percent carbon by mass.

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