The prize is around 20 grams. The mass of 1 calcium atom is 40 amu, therefore the mass of a mole that calcium atoms would certainly be 40 grams. 

Molar mass = 32 + (16 x 2 ) = 64 g/mol 1 mole => 64 g 6.02 x 10^23 molecules => 64 g mass of one molecule = 64 / 6.02 x 10^23 =1.06 x 10^-22 g




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