Question

How many oxide ions are in 0.55 grams of titanium oxide?

Answer 1

Answer: There are $0.052\times 10^{23}$ oxide ions

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:

$\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}=\frac{0.55gg}{64g/mol}=0.0086moles$

1 mole of TiO contains = $6.023\times 10^{23}$ oxide ions

Thus 0.0086 moles of TiO contains = $\frac{6.023\times 10^{23}}{1}\times 0.0086=0.052\times 10^{23}$ oxide ions

There are $0.052\times 10^{23}$ oxide ions