객관식
What is the mass percent of carbon (C) in C2H6O (ethanol)? Provide your answer to two decimal places.
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3. Chemical Reactions
Mass Percent
객관식
Which statement best describes the mass percent of water in an apple if the apple has a total mass of 150 g and contains 120 g of water?
A
The mass percent of water is 80%.
B
The mass percent of water is 150%.
C
The mass percent of water is 20%.
D
The mass percent of water is 12%.
검증된 단계별 안내1
Identify the total mass of the apple and the mass of water it contains. Here, the total mass is 150 g and the mass of water is 120 g.
Recall the formula for mass percent, which is given by: \(\text{Mass percent} = \left( \frac{\text{mass of component}}{\text{total mass}} \right) \times 100\%\).
Substitute the given values into the formula: \(\text{Mass percent of water} = \left( \frac{120\,\text{g}}{150\,\text{g}} \right) \times 100\%\).
Simplify the fraction inside the parentheses to find the ratio of water mass to total mass.
Multiply the simplified ratio by 100 to convert it to a percentage, which represents the mass percent of water in the apple.
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