Explain the difference between molar mass and molar ratio. make sure to explain when you would use each to complete stoichiometric conversions. i know about the molar mass/ ratio but idk how to explain the difference.

Molar mass is the formula weight of any compound or molecule, by simply taking the sum of the compounds' atomic weight. 

for example you can take glucose, C6H12O6

its molar mass is 180.0634 g/mol = 6(12.01) + 12(1.008) + 6(16.00) = 180.156. 

Whereas the molar ratio or mole to mole ratio is defined as the ratio between the compounds or elements in a reaction. So for example if you take the following reaction,

C6H12O6 → 6H2O + 6CO2

the molar ratio would be 1:6:6. In this you take the coefficient of each molecule. I hope this helps!