Carbon tetrachloride may be produced via the reaction between methane and chlorine gases: """ch4 (g) + 4 cl2 (g) => ccl4 (l) + 4 hcl (g)"""
if this reaction generates 2.50 gallons of ccl4, how many pounds (lbs) of hcl were also generated? the
density of ccl4 is 1.5867 g/ml.

i do not know how to approach this question because it features 4 different types of units:
an explanation would be appreaciated

Nitric acid can be formed in two steps from the atmospheric gases nitrogen and oxygen, plus hydrogen prepared by reforming natural gas. in the first step, nitrogen and hydrogen react to form ammonia: (g) (g) (g) in the second step, ammonia and oxygen react to form nitric acid and water: (g) (g) (g) (g) calculate the net change in enthalpy for the formation of one mole of nitric acid from nitrogen, hydrogen and oxygen from these reactions. round your answer to the nearest .