Question

What is the mass in grams of 1.80 moles of calcium?

Answer 1

You need the atomic masses :
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For 2.50 mol S :
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m = ( 2.50 ) ( 32.07 ) = 80.18 g <-----------------------------

For 1.80 mole Ca :
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m = ( 1.80 ) ( 40.08 ) = 72.14 g <----------------------------

For 0,50 mole C :
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m = (12 )( 0.5 ) = 6.0 g C <---------------------

For the Cu :
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m sub Cu = (nN sub CU )

m sub Cu = ( 3.20 ) 63.55 ) = 203.26 g <------------------------------------