Question

пж помогите с химией​

Answer 1

Ответ:

a)M(K2BO3) = 39 × 2 + 10 + 16 × 3 = 78 + 10 + 48 = 136

b)M(H3PO4) = 1 × 3 + 30 + 16 × 4 = 97

c)M(Cu(PO4)2) = 64 + ( 31 + 16 × 4) × 2= 254

d)M(Na2SO4) = 23 × 2 + 32 + 16 × 4 = 142

e)M(N2O5) = 14 × 2 + 16 × 5 = 108