A sample of a compound contains 32.0 g C and 8.0 g H. Its molar mass is 30.0 g/mol. What is the compound's molecular formula? Percent Composition and Molecular Formula A sample of a compound contains 32.0 g C and 8.0 g H. Its molar mass is 30.0 g/mol. What is the compound's molecular formula?Answer: C2H6 Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+