The mass of 2.5 mol of Ca atom has been 100 grams.
Moles of an element can be used as a concentration of the solute. The moles of an element can be calculated as:
Moles = \(\rm \dfrac{weight}{molecular\;weight}\)
The molecular weight of Ca = 40 g/mol
Moles of Ca given = 2.5 mol
The mass of 2.5 mol Ca:
2.5 mol = \(\rm \dfrac{weight}{40\;g/mol}\)
Weight of Ca = 2.5 mol \(\times\) 40 g/mol
Weight of Ca = 100 grams
The mass of 2.5 mol of Ca atom has been 100 grams.
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