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zubareva45

m(воздуха)=100г.

ω%(O₂)=20,15%

----------------------------

m(O₂)-?

Решение:

1. m(O₂)=ω%(O₂)×m(воздуха)÷100%

m(O₂)=20,15%×100г.÷100%=20,15г.

2. Ответ: 20,15г. маса кисню в 100г. повітря (н.у.)

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