Question

Copper (cu) is a transition element used in the making of coins. calculate the mass in grams of 0.0420

Answer 1

 The  mass  in grams  of 0.0420  moles is  calculated  as  below


mass =  moles x molar mass

the molar mass  of Cu=  63.5 g/mol
moles = 0.0420  moles

mass = 63.5 g/mol  x 0.0420= 2.667 grams  of Cu