If I have 9.1 moles of a gas at a pressure of 6.4 atm and a volume of 8 liters, what is the temperature in Kelvin?

10.063g / 10.00 ml = 1.0063 g/ml which rounds off to 4 sig figs as: 1.006 g/ml

Molarity is moles of solute over liters of solution. idk if that is what you are talking about, but you can convert moles of solute to grams of solute using dimensional analyzes by using molar mass found on the periodic table.

The mole ratio of hydrogen to ammonia is 3: 2.