5. Количество вещества у оксида углерода (2) равно 750 моль, так как коэффициент перед оксидом углерода (2) в 3 раза больше, чем перед оксидом железа. Найдём массу оксида углерода (2):
) When we went shopping we wanted to buy ___ new. C) something 2) I’m sorry, but I haven’t got ___ advice to give you. B) any 3) He looked at the engine but he couldn’t see . C) anything 4) She had ___ free time after she retired than previously. A) more 5) We usually drink ___ water in hot weather. B) a lot of 6) He wants ___ sugar in his tea. B) a little 7) Those are ___ files. A) Bill’s 8) There is ___ in our garden. A) a nest of a bird 9) This is these ball. C) boys’ 10) Ann had to use my ruler as she had left ___ at home. C) hers 11) The boys are with ___ mum today. C) their 12) Last Saturday we went fishing, but we didn’t catch many ___. B) fish 13) I can give you some money. ___ in my wallet. B) It is 14) Our two ___ are crying all the time. A) babies 15) What do you need these ___ for? A) boxes
1. Перепишем уравнение реакции получения железа:
Fe2O3 + 3CO = 3CO2 + 2Fe;
2. Вычислим молекулярную массу оксида железа:
56 * 2 + 16 * 3 = 160 г/моль;
3. Найдём количество вещества у оксида железа:
40000 / 160 = 250 моль;
4. Найдём молекулярную массу оксида углерода (2):
12 + 16 = 28 г/моль;
5. Количество вещества у оксида углерода (2) равно 750 моль, так как коэффициент перед оксидом углерода (2) в 3 раза больше, чем перед оксидом железа. Найдём массу оксида углерода (2):
750 * 28 = 21000 грамм (21 кг);
ответ: масса оксида углерода (2) равна 21 кг.
2) I’m sorry, but I haven’t got ___ advice to give you. B) any
3) He looked at the engine but he couldn’t see . C) anything
4) She had ___ free time after she retired than previously. A) more
5) We usually drink ___ water in hot weather. B) a lot of
6) He wants ___ sugar in his tea. B) a little
7) Those are ___ files. A) Bill’s
8) There is ___ in our garden. A) a nest of a bird
9) This is these ball. C) boys’
10) Ann had to use my ruler as she had left ___ at home. C) hers
11) The boys are with ___ mum today. C) their
12) Last Saturday we went fishing, but we didn’t catch many ___. B) fish
13) I can give you some money. ___ in my wallet. B) It is
14) Our two ___ are crying all the time. A) babies
15) What do you need these ___ for? A) boxes