Question

25 g of a metal (m) reacts with oxygen completely to produce 1.68 g of metal oxide. The empirical formula of the metal oxide is

Answer 1

Answer:

M

x

+O

2

→M

2

O

x

Percentage of M in oxide =

1.68

1.25

×100=74%

Percentage of O in oxide =(1−0.74)×100=26%

Let us take mass of the compound =100 g

M:

69.7

74

=1.06

O:

16

26

=1.625

Multiply by 2 we will get the simplest whole-number ratio so the empirical formula of oxide is M

2

O

3

.