Question

Convert into mole.
$\left(a\right)$ $12$ g of oxygen gas
$\left(b\right)$ $20$ g of water
$\left(c\right)$ $22$ g of carbon dioxide.

Answer 1

(a) Molecular weight of oxygen in grams = 32 g of oxygen= one mole of oxygen gas

Thus, 12 g of oxygen$=\frac{1}{32}\times 12=0.375moles$

(b) Molecular weight of water $\left(H_{2}O\right)$ in grams= 2+ 16=18 g=one mole of water

Thus, 20 g of water$=\frac{1}{18}\times 20=1.111moles$

(c) Molecular weight of carbon dioxide $\left(C{O}_2\right)$ in grams$=12+2\times 16=44g=$one mole of carbon dioxide

Thus, 22 g of carbon dioxide $=\frac{1}{44}\times 22=0.5moles$