# Density, Molar Mass and Stoichiometry

1) Calculate the density of NO2 gas at 0.970 atm and 33C degree.

2) Calculate the molar mass of a gas if 2.50g occupies 0.885L at 685 torr and 33C degree.

3) Calcium hydride,CaH2 , reacts with water to form hydrogen gas:

CaH2(s)+2H2O(l)>>Ca(OH)2(aq)+2H2(g)

This reaction is sometimes used to inflate life rafts, weather balloons, and the like, where a simple, compact means of generating H2 is desired.

How many grams of CaH2 are needed to generate 54.5L of H2 gas if the pressure of H2 is 813 torr at 21 C degree?

4) The metabolic oxidation of glucose,C6H12O6 , in our bodies produces CO2, which is expelled from our lungs as a gas:

C6H12O6(aq)+6O2(g)>>6CO2(g)+6H2O(l)

Calculate the volume of dry CO2 produced at body temperature (37 C degree) and 0.980 atm when 24.0 g of glucose is consumed in this reaction.

https://brainmass.com/chemistry/gas-stoichiometry/density-molar-mass-stoichiometry-305622

#### Solution Summary

Provides steps necessary to calculate the density, molar mass and stoichiometry.