Question

Read the chemical equation.

Mg + 2HCl → MgCl2 + H2

How many moles of MgCl2 are produced from 3 moles of HCl?

0.3
0.5
1.0
1.5

Answer 1

0.5

Step-by-step explanation:

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Answer 2

1.5 mol.

Step-by-step explanation:

• From the balanced equation: Mg + 2HCl → MgCl₂ + H₂,

It is clear that 1.0 mol of Mg reacts with 2.0 moles of HCl to produce 1.0 mol of MgCl₂ and 1.0 mol of H₂.

Using cross multiplication:

2.0 moles of HCl → 1.0 mole of MgCl₂.

3.0 moles of HCl → ??? mole of MgCl₂.

∴ The no. of moles of MgCl₂ are produced from 3.0 moles of HCl = (3.0 mol)(1.0 mol) / (2.0 mol) = 1.5 mol.