The molar mass of hydrogen (H2) is 2.02 g/mol. A sample contains 4.00 mol of H2. What is the mass, in grams, of this sample?
Answer
A
1.98 grams
B
2.02 grams
C
4.00 grams
D
8.08 grams
Explanation
Use mass = number of moles × molar mass. For 4.00 mol of H₂, the mass is 4.00 mol × 2.02 g/mol = 8.08 g. Therefore, the sample has a mass of 8.08 grams, choice D.
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