Question

How many a) molecules b) hydrogen atoms c) oxygen atoms are there in 0.5 mole of water.

Answer 1

no. of molecules in 1 mole H2O is 6.022× 10^23.
so no of moles in 1/2 or 0.5 mole is 1/2 × 6.022× 10^23 = 3.011×10^23.

Answer 2

Number of molecules, hydrogen atoms and oxygen atoms present in 0.5 mole of water

a) Molecules in 0.5 mole of water

WKT

1 mol of water = 6.022×$10^{23}$ molecules

∴ 0.5 mol of water = $\frac{6.022\times 10^{23}}{2}$

0.5 mol of water = $3.011\times 10^{23}$ molecules.

b) Hydrogen atoms

Water is composed of 2 hydrogen atoms and one oxygen atom.

1 mol of water = 2 × 6.022×$10^{23}$ atoms of hydrogen

∴ 0.5 mol of water = $\frac{2\times6.022\times10^{23} }{0.5}$

0.5 mol of water = 6.022×$10^{23}$ atoms of hydrogen.

c) Oxygen atom

Water contains one atom of oxygen.

1 mol of oxygen = 6.022×$10^{23}$ atoms of oxygen

0.5 mol of oxygen = $\frac{1\times6.022\times10^{23} }{2}$

0.5 mol of oxygen = $3.011\times 10^{23}$ molecules.

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