Question

How many a. grams b. molecules c. atoms , of hydrogen are their in 0.5 mole of water.
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Answer 1

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}10

23

molecules

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

2

6.022×10

23

0.5 mol of water = 3.011\times 10^{23}3.011 × 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}10

23

atoms of hydrogen

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

0.5

2×6.022×10

23

0.5 mol of water = 6.022×10^{23}10

23

atoms of hydrogen.

c) Oxygen atom

Water contains one atom of oxygen.

1 mol of oxygen = 6.022×10^{23}10

23

atoms of oxygen

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

2

1×6.022×10

23

0.5 mol of oxygen = 3.011\times 10^{23}3.011×10

23

molecules.

Learn more about such concept

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