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Question

Mg+O2MgO
If 0.486 g of magnesium is fully oxidized, what mass of magnesium oxide should be produced?

A
0.806 g MgO
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B
0.972 g MgO
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C
0.646 g MgO
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D
0.486 g MgO
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Solution

The correct option is A 0.806 g MgO

Mg + O2MgO

1 mole of Mg produces 1 mole of MgO.

Molar mass of MgO=24+16=40

So, 24 g Mg 40 g MgO
0.486 g Mg (x)

x=40×0.48624=40×0.02=0.806 g


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