Question

How many molecules of hydrogen chloride can be synthesized from 896L of chlorine gas at STP?

Answer 1

1. Mole is defined as the amount of substance that contains the same numbers of units (atoms, molecules, and ions) as there are atoms in exactly 12g of C -12 isotope.
2. The volume of dry gas at STP (Standard Temperature and Pressure) is 22.4 L i.e Volume of 1 mole of a gas at STP
3. Hydrogen combines with chlorine forming hydrogen chloride (HCl)
4. The balanced chemical equation is ${\text{H}}_2\left(g\right)+C{I}_2\left(g\right)\to 2HCl\left(g\right)$
5. The number of moles of chlorine reacted $\frac{volumegiven}{volumeof1moleatSTP}=\frac{896}{22.4}=40moles$
6. 40 x 6.023 x 10²³ molecules of Cl₂ gives 80 x 6.023x10²³ molecules of HCl gas

Therefore, the number of molecules of hydrogen chloride produced is 80 x 6.023x10²³ molecules. i.e 80 moles