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Q.

1.5 mole of O2 combines with Mg to form oxide MgO. The mass of Mg (at. mass 24) that has combined is 

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a

72 g

b

36 g

c

48 g

d

24 g

answer is A.

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Detailed Solution

Mg1  mole  +12  O20.5  mole        MgO

0.5 mole of oxygen react with 1 mole of Mg

1.5 mole of oxygen react with 1.50.5=  3  moles of Mg

                                                                          =24  ×  3=72  g. of Mg

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