Answer:
a) n = m/MM
n = 25g/180.16 g/mol = 0.139 mol
C = nv
C = (0.139 mol)(0.25 L)
C = 0.034 M
b) Same process, replace mass with 50 g.
C = 0.069 M
c) n = 50g/342.3 g/mol = 0.146 mol
C = nv
C = 0.146 mol x 0.25
C = 0.037
Order of increasing molarity:
A, C, B