Question

1g of silicon contains 'n' atoms. How many atoms are there in 0.8 gram of calcium

Answer 1

I hope it will help you

Answer 2

Answer: 0.5 n

Explanation:

$Moles=\frac{\text{Given mass}}{\text{Molar mass}}$

${\text {Moles of silicon}}=\frac{1g}}{28g/mol}=0.04moles$

Thus 0.04 moles of silicon contains n atoms.

According to Avogadro's law, 1 mole of every substance contains same number of particles $(6.023\times 10^{23})$

${\text {Moles of calcium}}=\frac{\text{Given mass}}{\text{Molar mass}}$

${\text {Moles of calcium}}=\frac{0.8g}{40g/mol}=0.02 moles$

0.04 moles of silicon contains n atoms.

0.02 moles of calcium contains=$\frac{n}{0.04}\times 0.02=0.5n$