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К100 г 10% раствора добавили 20 г воды, вычислить w раствора

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Maksim Lokhov

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Must Waste More Time...

Алексеевич620

Відомо: V(H2S)=11,2 л

Знайти: m(H2S)-?

Розв'язання:

б

Кількість речовини n=V/VМ, де VМ – постійна величина і за н.у. дорівнює 22,4 л/моль.

n(H2S)=11,2 л / 22,4 л/моль=0,5 моль.

З формули n=m/M, де M=Mr г/моль, знаходимо масу m=n•M.

Mr(H2S)=2•Ar(H)+Ar(S)=2•1+32=34, M(H2S)=34 г/моль.

m(H2S)=0,5 моль •34 г/моль = 17 г

б

1 моль сірководню за н.у. займає об’єм 22,4 л, тоді

х моль сірководню за н.у. займуть об’єм 11,2 л.

Складаємо пропорцію та розв’язуємо її.

1 моль / х моль = 22,4 л / 11,2 л, звідси

х моль • 22,4 л = 1 моль • 11,2 л,

х = (1 моль • 11,2 л) : 22,4 л,

х = 0,5 моль

З формули n=m/M, де M=Mr г/моль, знаходимо масу m=n•M.

Mr(H2S)=2•Ar(H)+Ar(S)=2•1+32=34, M(H2S)=34 г/моль.

m(H2S)=0,5 моль •34 г/моль = 17 г

Відповідь: 0,5 моль, 17 г.

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