Question

Convert 6.50g ZnSO4 to moles.

Answer 1

6,50g of ZnSO4 is 0,04 moles

Mass of ZnSO4  :    

m=6,50g

Molar mass of ZnSO4 :     

M=M(Zn)+M(S)+4*M(O)

M=65,38 g/mol+32,06 g/mol+4*15,99 g/mol

M=161,40 g/mol

Molarity of ZnSO4 :

n=m/M          

n=6,50g/161,40g/mol

n=0,04 mol