Question

Calculate the no. of hydrogen atoms in 36ml of water

Answer 1

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Density of Water is :

$1g \: {cc}^{ - 1} = \frac{1g}{ml}$

Total Mass of 36 ml water molecules =

$36ml \times \frac{1g}{1ml} = 36g$
Now,

Mass of one mole Water molecules is 18 g

=> Total water molecules = 2 moles

∆ Total '2' atoms of Hydrogen in one molecule of water

=> There are total 2 x 2 = 4 moles =

$4 \times 6.022 \times {10}^{23} = 2.409 \times {10}^{24}$
--> no. of atoms in 36 ml Water