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prokhoda1707
@prokhoda1707
September 2021
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Помогите пожалуйста с химией
задачи 3, 7, 11, 15
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ndambaeva
3. mFe3O4=3000·0.8=2.400g
2400g xg
Fe3O4+3CO=3Fe+3CO2
232g 168g
x=2400·168÷232=1737?9g≈1.7kg
7.
xg 35.1g
2NaOH+2Al(OH)3=2NaAlO2+3H2O
80g 156g
x=80·35.1÷156=18g
18g-20%
xg -100%
x=18·100÷20=90g
11.
V(CH4)=1000·0.1=100L
100L xL
CH4+ 2O2=CO2+2H2O
22.4L 44.8L
x=100·44.8÷22.4=200L
V(vozd)=5V(O2)=200·5=1000L
15.
2.8L xL
2H2 +O2 = 2H2O
44.8L 22.4L
x=2.8·22.4÷44.8=1.4L
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prokhoda1707
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Answers & Comments
2400g xg
Fe3O4+3CO=3Fe+3CO2
232g 168g
x=2400·168÷232=1737?9g≈1.7kg
7.
xg 35.1g
2NaOH+2Al(OH)3=2NaAlO2+3H2O
80g 156g
x=80·35.1÷156=18g
18g-20%
xg -100%
x=18·100÷20=90g
11.
V(CH4)=1000·0.1=100L
100L xL
CH4+ 2O2=CO2+2H2O
22.4L 44.8L
x=100·44.8÷22.4=200L
V(vozd)=5V(O2)=200·5=1000L
15.
2.8L xL
2H2 +O2 = 2H2O
44.8L 22.4L
x=2.8·22.4÷44.8=1.4L