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Q.

When 0.0976g of magnesium was heated in the air, 0.1618g of magnesium oxide (MgO) was produced. What is the mass of oxygen needed to produce 0.1618g MgO?

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a

96 g

b

5.33 g

c

0.0642 g

d

20

answer is C.

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Detailed Solution

Solution:

Concept: According to the law of conservation of mass the total mass of the products is equal to the total mass of the reactants.

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Hence the mass of oxygen needed to produce 0.1618g MgO is 0.0642g.

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When 0.0976g of magnesium was heated in the air, 0.1618g of magnesium oxide (MgO) was produced. What is the mass of oxygen needed to produce 0.1618g MgO?