Question

Deduce the number of molecules of 8 gm. magnesium oxide. *​

Answer 1

Answer:

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Answer 2

Given: 8 gram magnesium oxide.

To find: We have to find the number of molecules.

Solution:

The chemical formula of magnesium oxide is MgO.

Number of moles is a ratio of mass to molecular mass.

Molecular mass of Magnesium oxide(MgO) is 24+16=40.

So, number of moles of Magnesium oxide will be-

$\frac{8}{40} = \frac{1}{5} \\ = 0.2$

1 mole of magnesium oxide contains $6.023×10^{23}$ number of molecules.

0.2 mole of magnesium oxide contains $6.023×10^{23}×0.2=1.2×10^{23}$ number of molecules.

Thus there are $1.2×10^{23}$ number of molecules present in 8 gram of magnesium oxide.