Предмет: Химия, автор: olgarabota09

Розрахувати масові частки елементів у сполуках
Допоможіть будь ласка!

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Ответы

Автор ответа: IlonovaKatya
0

Масова частка (w) = n(E)×Ar(E)/Mr(сполуки)×100%

А) KNO3

Mr(KNO3)= 39+14+3×16= 101 г/моль

w(K)= 1×39/101×100%= 38,6%

w(N)= 1×14/101×100%= 13,8%

w(O)=3×16/101×100%= 47,5%

Б) NaHSO4

Mr(NaHSO4)= 23+1+32+4×16= 120 г/моль

w(Na)=1×23/120×100%= 19%

w(H)=1×1/120×100%= 0,8%≈1%

w(S)= 32/120×100%=26,6%≈27%

w(O)=4×16/120×100%=53%

В) BaCO3

Mr(BaCO3)= 137+12+3×16=197 г/моль

w(Ba)= 1×137/197×100%= 69,5%≈70%

w(C)= 1×12/197×100%=6%

w(O)=3×16/197×100%=24%

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