berapa gram CH3COOH yang harus dilarutkan untuk membuat 250ml larutan CH3COOH 0,5 M?

diketahui :
M = 0,5 M
v = 250ml
mr = 60
ditanya : Massa = .... gr
jwb :

M = gr/Mr × 1000/v
0.5 = gr/60 × 1000/250
0.5 = gr/60 × 4
0.5 × 60 = 4gr
0.5 × 60 / 4 = gr
0.5 × 15 = gr
7.5 = gr

molar = gr/mr x 1000/v

0.5 = gr/60 x 1000/250
0.5 = gr/60 x 4
30 = 4gr
gr = 30/4 =7.5 gram