Answer: 3.16
Step-by-step explanation:
First, find the molarity of calcium acetate. Change g to mol and mL to L.
The molar mass of calcium acetate is 158.168 g/mol so...
25.0/158.168= 0.158 mol
100 mL is 0.1L (divide by 1000) Divide the moles by the L;
0.158/0.1 = 1.58
This is the molarity of calcium acetate but we want the concentration of just acetate. The chemical formula would be
Ca(C2H3O2)2 -> Ca + 2C2H3O2
meaning for every one mol of calcium acetate, there will be two moles of acetate. Thus, multiply your answer by two to get the molarity/concentration of the acetate.
1.58×2=3.16 M