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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_(Ca)=40g·mol^(-1)#

And then,
#9.8# #g·(1mol)/(40g)=0.245# #mol# #Ca#.

Answer 2 · 2017-11-16T22:02:43

#"0.24 moles"#

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

#"9.8 g"/"40.078 g/mol" = "0.24 moles"#