Mass-Volume Calculations

In Mass-Volume Calculations a mass is given and a volume is to be found. This group of calculations depends upon the use of molar volume. The molar volume of any gas at standard temperature and pressure is 22.4 dm³ 

Example 6.4.1:

Calculate the volume of Carbon[IV]oxide gas at STP when 5 g of zinc trioxocarbonate[V] is heated strongly.

[Zn = 65, C = 12, O = 16, molar volume = 22.4 dm³ at STP] 

Solution

ZnCO_3[s]  → ZnO_[s] + CO_2[g]

1 mole of ZnCO_3[s]  ⇒ 1 mole of CO_2[g] at STP

1 × [65 + 12 + (16 × 3)] g of ZnCO_3[s]  ⇒ 1 × 22.4 dm³