Chemistry - Mole Concept Question with Solution | TestHub

(1) $4u$ of $\mathrm{He}=\frac{4u}{4u}=1\mathrm{He}$ atom (2) 4 g of Helium $=\frac{4\mathrm{g}}{4\mathrm{g}}$ mole $=1$ mole $={\mathrm{N}}_{\mathrm{A}}\mathrm{He}$ atom (3) $\begin{array}{rl}2.2710982\text{ of He at STP }& =\frac{2.271}{22.710982}\text{ mole }\\ & =0.1\mathrm{mole}\\ & =0.1{\mathrm{N}}_{\mathrm{A}}\mathrm{He}\text{ atom }\end{array}$ (4) 4 mol of $\mathrm{He}=4{\mathrm{N}}_{\mathrm{A}}\mathrm{He}$ atoms