tolong dibantu ya pliss sebisanya saja

7 . Mr CuSO4.5H2O
CuSO4 . 5H2O  = 63,5 + 32 + 4.16 +5(2.1+ 16)
Mr = 63,5 + 32 + 64 + 90
Mr =249,5

8.Mr Fe2(SO4)3 = 400
( Ar Fe x2) + ( 96 x 3 ) = 400
( Ar Fe x2) = 400 - 288
Ar Fe = 112 / 2 = 56

9 . N2H4
mol N2H4 = gr / mr = 8 / 30 = 0,27
Jp = mol X avogadro
jp  = 0,27 x 6,02 x 10^23 = 1,63 x 10^23

10 , Cu
mol Cu = 0,1 mol
Jp = mol X avogadro
jp  = 0,1 x 6,02 x 10^23 = 6,02 x 10^22

11.NO2
mol NO2 = 2 mol
Jp = mol X avogadro
jp  = 2 x 6,02 x 10^23 = 1,204 x 10^24

12. jp = mol x A
mol = jp / A = 1,204 x 10^23 / 6,02 x 10^23 = 0,2 mol