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Answer 1 · 2017-11-16T21:48:16

0.245 mol Ca

We only need to know the atomic mass of calcium,
$M_{C a} = 40 g \cdot m o l^{- 1}$ $M_(Ca)=40g·mol^(-1)$

And then,
$9.8$ $9.8$ $g \cdot \frac{1 m o l}{40 g} = 0.245$ $g·(1mol)/(40g)=0.245$ $m o l$ $mol$ $C a$ $Ca$ .

Answer 2 · 2017-11-16T22:02:43

$0.24 moles$ $"0.24 moles"$

To convert grams to moles, divide the mass in grams by the molar mass of calcium.

$\frac{9.8 g}{40.078 g/mol} = 0.24 moles$ $"9.8 g"/"40.078 g/mol" = "0.24 moles"$