15. A 22.4-L sample of which of the following substances, at STP, would contain 6.02 x 10^23 representative particles? *
a. gold
b. sodium chloride
c. sulfur
d. carbon dioxide
16. What information is needed to calculate the percent composition of a compound? *
a. the formula of the compound and the atomic mass of its elements
b. the formula of the compound and its volume
c. the weight of the sample to be analyzed and its molar volume
d. the weight of the sample to be analyzed and its state of matter
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