Tolong bantuan nya… plisss​

no 1)

Mr Na2 S2 O3 =

2 x Ar Na + 2 x Ar S + 3 x Ar O =

2 x 23 + 2 x 32 + 3 x 16 =

46 + 64.+ 18 =

128

mol = M x v = 2 x 0,25 = 0,5 mol

massa = mol x Mr = 0,5 x 128 = 64 gram

no 2)

Mr NaOH = 23 + 16 + 1 = 40

molaritas = M =

gr/Mr x 1000/ml =

2/4 x 1000/500 =

1/2 x 2 =

1 M

no 3)

mau no 3, kerjain sendiri..

1 post 1 soal -_-