# How much oxygen is required to burn 3 moles of calcium?

August 29, 2021 | education

| The amount of calcium substance is 3 mol.

Determine the amount of oxygen needed to burn calcium.

First, you need to write down the reaction equations for this reaction.

2Ca + O2 = 2CaO.

According to the reaction equation, we determine the amount of oxygen.

3 moles of calcium – x moles of oxygen.

2 mol of calcium – 1 mol of oxygen.

Let’s define the unknown value of x.

X = 1 * 3: 2 = 1.5 mol.

Next, we determine the volume of oxygen. We use the following formula.

n = V / Vm.

V = n * Vm = 1.5 mol * 22.4 l / mol = 33.6 l.

Answer: the volume of oxygen is 33.6 liters.

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