Question

Calculate the moles of $CaS{O}_4$ present in a pure sample of 1360 g $CaS{O}_4.$

• A. 15 mol
• B. 25 mol
• C. 10 mol
• D. 20 mol

Answer 1

The correct option is C 10 mol

The mass of 1 mole of $CaS{O}_4=40+32+16\times 4=136$ g

Therefore,
$1360gCaS{O}_4=\frac{1360g}{136g/mol}=\text{10 mol}CaS{O}_4$