Question

Calculate the mass of nitrogen which contain the same number of molecules as are contained in 4.4 grams of carbon dioxide.

Answer 1

$$\begin{gathered} 44\mathrm{grams}\mathrm{of}{\mathrm{CO}}_2\mathrm{contains}=6.022\times {10}^{23}\mathrm{molecules} \\ 4.4\mathrm{grams}\mathrm{of}{\mathrm{CO}}_2\mathrm{contains}=0.6022\times {10}^{23}\mathrm{molecules} \\ \mathrm{Mass}\mathrm{of}6.022\times {10}^{23}\mathrm{molecules}\mathrm{of}\mathrm{nitrogen}=28\mathrm{grams} \\ \mathrm{Mass}\mathrm{of}0.6022\times {10}^{23}\mathrm{molecules}\mathrm{of}\mathrm{nitrogen}=2.8\mathrm{grams} \end{gathered}$$