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3 Quantitative chemistry

3 Quantitative chemistry

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Question 4

Magnesium oxide is produced by burning magnesium in oxygen gas.

The equation for the reaction is:

2Mg+O2→2MgO 2\text{Mg} + \text{O}_2 \rightarrow 2\text{MgO} 2Mg+O2​→2MgO

Calculate the volume of oxygen gas needed to react completely with 6.0 g6.0\text{ g}6.0 g of magnesium.

You should calculate:

  • the number of moles of magnesium used
  • the number of moles of oxygen gas that react with 6.0 g6.0\text{ g}6.0 g of magnesium
  • the volume of oxygen gas needed.

Relative atomic mass (ArA_rAr​): Mg=24\text{Mg} = 24Mg=24

The volume of 1 mole of gas = 24 dm324\text{ dm}^324 dm3

[3]
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3 Quantitative chemistry Questions

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