Chemistry - Mole Concept Question with Solution | TestHub

At STP $22.4\mathrm{L}{\mathrm{H}}_2=6.023\times 10^{23}$ molecules $$\begin{array}{rl}15\mathrm{L}{\mathrm{H}}_2& =\frac{6.023\times 10^{23}\times 15}{22.4}\\ & =4.033\times 10^{23}\\ 5\mathrm{L}{\mathrm{N}}_2& =\frac{6.023\times 10^{23}\times 5}{22.4}\\ & =1.344\times 10^{23}\\ 0.5\mathrm{g}{\mathrm{H}}_2& =\frac{6.023\times 10^{23}\times 0.5}{2}\\ & =1.505\times 10^{23}\\ 10\mathrm{g}{\mathrm{of}}_2& =\frac{6.023\times 10^{23}\times 10}{32}\\ & =1.882\times 10^{23}.\end{array}$$