If 2.0 L of 0.500 M solutions of NH3 is completely used up in a reaction with O2, how many grams of oxygen is needed? Molar mass of O2 is 31.998 g/mol A. 21.3 g
B. 48.0 g
C. 76.0 g
D. 192 g

             0.825 Liters

Solution:

As we know,

                          1 Cubic Centimeter (cm³)  =  0.001 Liters (L)
So,
                               825 Cubic Centimeter  =  X Liters 

Solving for X,

                      X  =  (825 cm³ × 0.001 L) ÷ 1 cm³

                      X  =  0.825 L