Під час фотосинтезу зелені листки рослин увібрали карбон (ІV) оксид масою 528 кг. Обчисліть , який об‘єм кисню (н.у.) виділився в атмосферу та яка маса глюкози утворилася.
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ответ: Для приготовления 3 литров 30% сиропа необходимо взять 1017 г сахара и 2373 г воды.
Дано:
V(p-pa) = 3 л = 3000 мл
ρ(р-ра) = 1,13 г/мл
ω(сахара) = 30% или 0,3
Найти:
m(H2O)-?
m(сахара)-?
Объяснение:
Находим массу раствора сиропа:
m(p-pa) = ρ(p-pa)*V(p-pa) = 3000 мл*1,13 г/мл = 3390 г
Находим массу сахара в сиропе:
m(сахара) = m(p-pa)*ω(сахара) = 3390 г*0,3 = 1017 г
Находим массу воды:
m(H2O) = m(p-pa) - m(сахара) = 3390 г - 1017 г = 2373 г
ответ: Для приготовления 3 литров 30% сиропа необходимо взять 1017 г сахара и 2373 г воды.