CH-1908

The mole

Chemistry · Secondary 4 · Easy · The mole

A student measures the mass of a sample of seawater and finds it contains 0.40 g of dissolved calcium ions, Ca²⁺. The relative atomic mass of calcium is 40. What is the amount of substance of Ca²⁺ present in the sample?

$0.010\,\text{mol}$
$0.16\,\text{mol}$
$0.040\,\text{mol}$
$0.0040\,\text{mol}$

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