The mass in grams of 0.45 mole of `Ca^(2+)` ions

Answer

A

Explanation

Ca = Atomic mass = 40
` Ca to Ca^(2+) + 2e^(-)`
41 g of Ca = 1 mole (for `Ca^(2+)` = Atomic mass remains same)
1 mole of `Ca^(2+)` = 40 g
`:.` 0.45 mole of `Ca^(2+)=40/1xx0.45=18g`