Question

The number of oxygen atoms present in 1 mole of oxalic acid dihydrate is:
A.$6 \times {10^{23}}$
B.$6.022 \times {10^{34}}$
C.$7.22 \times {10^{23}}$
D.$36.13 \times {10^{23}}$

Answer 1

Hint: The mole is basically a unit of measurement for the amount of substance in SI units. As we all know that one dozen contains twelve items similarly one mole contains $6.022 \times {10^{23}}$ items or products. Mostly the mole term is used for atoms, molecules, ions, electrons etc.

Complete step by step answer:
The chemical formula of oxalic acid is ${C_2}{H_2}{O_4}.2{H_2}O$ .
As given in the problem, it is a dihydrate molecule. That’s why we added two molecules of water to it.
As we can see that one molecule of dihydrate oxalic acid has 6 oxygen atoms.
And we know that 1 mole=$6.022 \times {10^{23}}$molecules
Therefore,
$6.022 \times {10^{23}}$molecules of oxalic acid=$6 \times 6.022 \times {10^{23}}$ atoms of oxygen
1 mole of oxalic acid=$36.13 \times {10^{23}}$ atoms of oxygen.
Hence option (D) is correct, $36.13 \times {10^{23}}$.

Note:
Oxalic acid is an organic compound with the formula ${C_2}{H_2}{O_4}$. It is white crystalline solid that forms a colourless solution in water. It is an essential household chemical also, it is used as cleaner for various things due to its acidic properties.