Question

A compound (MO) contains 20% oxygen. find out atomic weight of M and molecular weight of MO.

Answer 1

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An oxide of a metal (M) contains 40 % by mass of oxygen.

100 g of the oxide will contain 60 g of metal and 40 g of oxygen.

Metal (M) has an atomic mass of 24.

40 g of metal corresponds to 24\60 =2.5mol

Oxygen has an atomic mass of 16.

60 g of oxygen corresponds to 16\40 =2.5mol

Hence, the ratio of the number of moles of metal to oxygen is 1:1.

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