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mass= molar mass*moles
a)molar mass of Na=23 g/mol
mass of Na=23 g/mol *0.25 mols
mass of Na=5.75 g
b)molar mass of Ca=40 g/mol
molar mass of Cl=35.5 g/mol
molar mass of CaCl2=40+35.5*2
mass of calcium chloride=111 g/mol *0.25 mols
mass of calcium chloride=27.75 g
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