Question

The number of atoms in $52$ moles of He is$?$

• A. $3.131\times {10}^{25}$
• B. $7.828\times {10}^{24}$
• C. $39.948\times {10}^{24}$
• D. $8.546\times {10}^{23}$

Answer 1

Answer: (B)

$7.828\times {10}^{24}$

Number of moles of $He=\frac{52}{4}=13$

Number of atoms of $He=moles\times N_A=7.828\times {10}^{23}atoms$