using a sample having 150ml of nitroglycerinng

Question

Using a sample having 1.50mL of nitroglycerin(NG) that has density=1.592g/mL then calculate how many total moles of gas are produced?

Ethyl mercaptan C₂H₆S(The volatile liquid) is knows as one of the most odoriferous substances and It may be combined with natural gas to make leaks detectable. Calculate how many molecules of C₂H₆S (ethyl mercaptan )are contained in 1.0 micro liter sample if the given density = 0.84 g/mL