Question

5, 6, 8 , 9 .
Фото.

Answer 1

Ответ:

Объяснение:

5) М(Na2O) = Ar(Na) * 2 + Ar(O) = 23 * 2 + 16 = 62

w(Na) = Ar(Na) * n / М(Na2O) * 100% = 23 * 2 / 62 * 100% = 74,19%

w(О) = Ar(О) * n / М(Na2O) * 100% = 16/62 * 100% = 25,81%

6) М(Р2О5) = Ar(Р) * 2 + Ar(O) * 5 = 31 * 2 + 16 * 5 = 142

w(Р) = Ar(Р) * n / М(Р2О5) * 100% = 31 * 2 / 142 * 100% = 43,66%

w(О) = Ar(О) * n / М(Р2О5) * 100% = 16 * 5/142 * 100% = 56,34%

8)М(SО3) = Ar(S)  + Ar(O) * 3 = 32 + 16 * 3 = 80

w(S) = Ar(S) * n / М(SО3) * 100% = 32 /80* 100% = 40%

w(О) = Ar(О) * n / М(SО3) * 100% = 16 * 3/80 * 100% = 60%

9) М(B2О3) = Ar(B) * 2  + Ar(O) * 3 = 11 * 2 + 16 * 3 = 70

w(B) = Ar(B) * n / М(B2О3) * 100% = 11 * 2 /70* 100% = 31,43%

w(О) = Ar(О) * n / М(B2О3) * 100% = 16 * 3/70 * 100% = 68,57%