Question

A chemist determines by measurements that .070 moles of hydrogen gas participate in a chemical reaction. Calculate the mass of hydrogen gas that participates. Round your answer to significant digits.

Answer 1

Answer: 0.14g

Explanation:

Mass conc. = n x molar Mass

Mass conc. = 0.070 x 2 = 0.14g

Answer 2

Answer:

The mass of hydrogen gas that participates is 0.14 grams

Explanation:

Step 1: Data given

Moles of H2 = 0.070 moles

Molar mass H2 = 2.02 g/mol

Step 2: Calculate the mass of hydrogen gas

Mass of H2 = moles H2 * molar mass H2

Mass of H2 = 0.070 moles * 2.02 g/mol

Mass of H2 = 0.14 grams

The mass of hydrogen gas that participates is 0.14 grams