Question

The molar mass of carbon dioxide is 44 g. The number of molecules present in 176 g of carbon dioxide is

• A. $4.81\times {10}^{24}$
• B. $2.41\times {10}^{24}$
• C. $1.20\times {10}^{24}$
• D. $8.02\times {10}^{24}$

Answer 1

The correct option is B $2.41\times {10}^{24}$

Given, mass of carbon dioxide = 156 g
Also, molar mass of ${\text{CO}}_2$ = 44 g
Avogadro number = $6.022\times {10}^{23}$
Number of molecules of carbon dioxide
= $\frac{176}{44}\times 6.022\times {10}^{23}$
= $2.41\times {10}^{24}$