The chemical equation below shows the burning of magnesium (Mg) with oxygen (O2) to form magnesium oxide (MgO). 2Mg O2 Right arrow. 2MgO The molar mass of O2 is 32. 0 g/mol. What mass, in grams, of O2 is required to react completely with 4. 00 mol of Mg? 2. 00 grams 64. 0 grams 128 grams 256 grams.

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11-03-2022
Chemistry

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The chemical equation below shows the burning of magnesium (Mg) with oxygen (O2) to form magnesium oxide (MgO). 2Mg O2 Right arrow. 2MgO The molar mass of O2 is 32. 0 g/mol. What mass, in grams, of O2 is required to react completely with 4. 00 mol of Mg? 2. 00 grams 64. 0 grams 128 grams 256 grams.

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aliasger2709 aliasger2709 · Answer 1 · 2022-03-17T06:27:33+01:00

Magnesium or metal reacts with oxygen to produce magnesium oxide or metal oxide. The mass of oxygen needed to completely react with magnesium is 64 g.

What is mass?

Mass is the weight or the quantity of the substance that is estimated in grams and kilograms.

The balanced reaction can be given as:

[tex]\rm 2Mg + O_{2} \rightarrow 2MgO[/tex]

From the balanced reaction, 2 moles of magnesium and 1 mole of oxygen are required to produce 2 moles of magnesium oxide.

If 2 mol Mg requires 1 mol oxygen then, 4 mol Mg will need 2 mol of oxygen.

The mass of oxygen can be calculated as:

[tex]\begin{aligned}\rm mass &=\rm molar\; mass \times moles \\\\&= 32 \times 2\\\\&= 64 \;\rm gm\end{aligned}[/tex]

Therefore, option B. 64 gm of oxygen are required.

Learn more about mass and moles here:

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