Homework Answers
No. of moles = Weight of the substance / molecular mass
1) Weight of Na2S2O8 = 28.0 grams
Molecular mass of Na2S2O8 = 238.09 gram/mol
no. of moles = 28.0 / 238.09 = 0.1176 moles = 11.76 x 10-2 moles
2)
Weight of ZnF2 = 14.9 grams
Molecular mass of ZnF2 = 103.377 gram/mol
no. of moles = 14.9 / 103.377 = 0.14413 moles = 14.413 x 10-2 moles
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