Curious carl and his lab partner were conducting a variety of experiments to produce gases: hydrogen, oxygen, and carbon dioxide. in one experiment, they added a piece of magnesium ribbon to 10 milliliters of hydrochloric acid. they observed bubbles being produced and did a variety of tests to identify the escaping gas; it proved to be hydrogen. the reaction is represented by the following equation:
mg + 2hcl → mgcl2 + h2(g)

what is the mass, in grams, of two moles of hcl?
a) 18.3 g
b) 36.5 g
c) 72.0 g
d) 73.0 g