Question

решить задачи 2,3.Химия 8 класс.​

Answer 1

Ответ:

Объяснение:

Mr(CuSO4) = 64 + 32 + 16 * 4 = 160

w(Cu) = n * Ar(Cu)/ Ar(CuSO4) * 100% = 64/160* 100% = 40%

w(S) = n * Ar(S)/ Ar(CuSO4) * 100% = 32/160 * 100% = 20%

w(O) = n * Ar(O)/ Ar(CuSO4) * 100% = 4 * 16/160 * 100% = 40%

Mr(Ca(OH)2) = 40 + (16 + 1) * 2 = 74

w(Ca) = n * Ar(Ca)/ Ar(Ca(OH)2) * 100% = 40/74* 100% = 54,1%

w(O) = n * Ar(O)/ Ar(Ca(OH)2 * 100% = 2 * 16/74* 100% = 43,2%

w(H) = n * Ar(H)/ Ar(Ca(OH)2) * 100% = 2 * 1/74 * 100% = 2,7%