If you measure 610.39 grams of CaCl2, how many moles do you have?

Answer 1

Find the molar mass. Add up the masses of the elements from the periodic table.

CaCl₂ is made of Ca+2Cl

mass of Ca=40.08

mass of Cl=35.45

molar mass=Ca+2Cl=40.08+2(35.45)=110.98 g/mol

moles = grams ÷ molar mass

moles = 610.39 g ÷ 110.98g/mol

=5.5 mol CaCl₂