Question

Convert into mole:
a) 88g of Carbon di oxide.
b) 8g of Oxygen atom.

Answer 1

Answer:

A. The mass number of CO2 = 2x16 + 12 =44 so one mole of C02 has a mass of 44g. Two moles of CO2 weighs 2 x 44 = 88g.

B. Calculation: The molar mass of oxygen is 16. Conclusion: 8 g of oxygen is composed of 0.5 moles.

Answer 2

Answer:

(a) 88 of Carbon dioxide equals 2 moles of Carbon dioxide.

(b) 8 g of Oxygen equals 0.5 moles of Oxygen.

Explanation:

The number of moles is given as,

$n=\frac{\text{Given mass}}{\text{Molecular mass}}$

(a) 88 g of Carbon dioxide equals,

$n=\frac{88\text{ g}}{44\text{ g}}\\=2\text{ moles}$

(b) 8 g of Oxygen atom equals,

$n=\frac{8\text{ g}}{16\text{ g}}\\=0.5\text{ moles}$