Question

How many atoms are in 16.1 G Sr

Answer 1

Answer: There are $1.11\times 10^{23}$ atoms of Sr

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number $6.023\times 10^{23}$ of particles.

To calculate the moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}=\frac{16.1g}{87.6g/mol}=0.184moles$

1 mole of Sr contains =  $6.023\times 10^{23}$ atoms of Sr

Thus 0.184 moles of Sr contains =  $\frac{6.023\times 10^{23}}{1}\times 0.184=1.11\times 10^{23}$ atoms of Sr

Thus there are $1.11\times 10^{23}$ atoms of Sr