MCAT Question A Day - 10/22/14 - Answer!
What is the percent by mass of carbon in CO2?
A. 12%
B. 27%
C. 33%
D. 44%
B is correct. C has 12 g / mol and 0 has 16 g / mol. The total weight of CO, is 44 g / mol. Carbon's weight divided by the total weight is 12 / 44= 0.27. We multiply by 100 to get 27%.
B is correct. C has 12 g / mol and 0 has 16 g / mol. The total weight of CO, is 44 g / mol. Carbon's weight divided by the total weight is 12 / 44= 0.27. We multiply by 100 to get 27%.
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