Question

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 1

The mass of a sample containing 4.00 mol of H2 is 8.08 g. The molar mass of hydrogen (H2) is 2.02 g/mol. In other words, there are 2.02 g in 1.00 mol of H2. The question is how many grams are in 4.00 mol of H2. Let's use proportion: 2.02 g : 1.00 mol = x : 4.00 mol. x = 2.02 g * 4.00 mol : 1.00 mol. x = 8.08 mol. Thus, there are 8.08 g of the sample of 4.00 mol of H2.

Answer 2

Answer:

The mass of a sample containing 4.00 mol of H2 is 8.08 g.