Question

How many grams of Na2O are needed to make 10.0 L of a 0.250 M solution?

Answer 1

n[Na2O]= CxV
We have C= 0.250M, V=10.0L
So n[Na2O]= 0.250x10.0=2.5mol
M[Na2O]=62g/mol
—> m= nxM = 2.5x62=155g

Answer 2

154.9475 grams

Step-by-step explanation:

61.979g/mol is molar mass of Na2O

61.979g/mol times .250 M times 10L = 154.9475 grams