Ncert Exercises & Solutions

Match the following:

Codes:

Hint: $Number of moles = \frac{amount of substance}{molar mass of substance}$

A. Number of moles of CO₂ molecule

= \frac{Weight in gram of {CO}_{2}}{Molecular weight of {CO}_{2}} = \frac{88}{44} = 2 mol

1 mole of a substance = N_{A} molecules = 6.022 \times 10^{23} molecules

= Avogadro number

= 6.022 \times 10^{23} molecules of H_{2} O = 1 mol

22.4 L of O_{2} at STP = 1 mol

5.6 L of O_{2} at STP = \frac{5.6}{22.4} mol = 0.25 mol

D. Number of moles of 96 g of

O_{2} = \frac{96}{32} mol = 3 mol