Question

How many atoms of $P$ are present in 0.15 moles of $P_4$ molecules?

• A. $9.0\times {10}^{22}$
• B. $3.6\times {10}^{23}$
• C. $0.60$
• D. $6.0\times {10}^{23}$

Answer 1

The correct option is B $3.6\times {10}^{23}$

$1$ mole of $P_4$ contains $=4\times 6.0\times {10}^{23}=24.0\times {10}^{23}$ atoms

Hence, $0.15$ mole of $P_4$ contains $=4\times 1.56\times {10}^{23}$ atoms $=3.6\times {10}^{23}$ atoms

Hence, option B is correct.