What is the number of molecules in each of 32g $O_{2}$ and 44 ${CO}_{2} ?$

Open in App

Solution

Given mass of $O_{2}$ = 32g
Mole = $\frac{Given mass}{Molecular mass}$ = $\frac{32}{32} = 1 mol$
Mole = $\frac{Number of molecules (N)}{Avogadro number}$
N = Mole $\times$ $N_{A}$
N = 1 $\times 6.022 \times 10^{23}$ molecules

Given mass of ${CO}_{2}$ = 44g
Mole = $\frac{44}{44} = 1 mol$
N = Mole $\times$ $N_{A}$
N = 1 $\times 6.022 \times 10^{23}$ molecules

Suggest Corrections

Similar questions

Samples of the gases O₂, N₂, CO₂ and CO under the same conditions of temperature and pressure contain the same number of molecules represented by X. The molecules of oxygen [O₂], occupy V litres and have a mass of 8 g. Under the same conditions of temperature and pressure:
(a) What is the volume occupied by:
(i) X molecules of N₂?
(ii) 3X molecules of CO? [C = 12, N = 14, O = 16]
(b) What is the mass of CO₂ in g?
(c) In answering the above questions, which law have you used?

Samples of the gases $O_{2}, N_{2}, C O_{2}$ and CO under the same condition of temperature and pressure contain the same number of molecules x. The molecules of oxygen occupy V litres and have a mass of 8 g under the same what is the volume occupied by
(a) x molecules of $N_{2}$
(b) 3x molecules of CO,
(c) What is the mass of $C O_{2}$ in grams?
(d) In answering the above questions, which law have used?