Calculate the number of moles of hydrogen atom in 72 gms of water.

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Solution

The correct option is D
8

The chemical formula of water is H2O.
Given mass of water = 72gm

Molar mass of water=18gm

Number of moles of water =72/18=4moles

In 1 molecule of water we have 2 atoms of hydrogen

So in 1 mole we will have 2 moles of hydrogen

So in 4 moles of water, we have 8 moles of H atoms.

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Calculate the number of moles of H₂ molecule present in 72 gms of water.

0.9 g m

C_{6} H_{12} O_{6}

1 : 8

\frac{3}{2}

6 \times 4 \div 12 + 72 \div 8 - 9

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