Question

Aluminum metal reacts with hydrochloric acid to produce solid aluminum chloride and hydrogen gas. how many moles of aluminum are needed to produce 1.2 moles of hydrogen gas?

Answer 1

Moles of Aluminum needed : 0.8

Further explanation

Given

1.2 moles H₂

Required

moles of aluminum

Solution

The reaction coefficient in a chemical equation shows the mole ratio of the components of the compounds involved in the reaction (reactants and products)

Reaction(balanced equation)

2Al + 6 HCl = 2AlCl₃ + 3H₂

From the equation, mol ratio of Al : H₂ = 2 : 3, so mol Al :

= 2/3 x mol H₂

= 2/3 x 1.2

= 0.8 moles