Ответ №1
1. mNa2CO3=1000g·0.1=100g
mH2O=1000-100=900g
2. mr=30+600=630g
wBa(NO3)2=30/630·100%=4.76%
3. mNaCl=2mol·58.5=117g
117g-100%
x-100%
x=100·117/25=486g
mH2O=468-117=351g
4. mv1=50·0.15=75g
mv2=125·0.4=50g
mr-ra=50+125=175g
mv3=75+50=125g
w3=125/175·100%=71.4%
5. msoli=150·0.12=18g
mr-ra2=150+200=350g
wSO2=18/350·100%=5%
6. msoli1=120·0/4=48g
msoli2=48+20=68g
mr-ra2=120+20=140g
w2=68/140·100%=46%
7.mCuSO4·5H2O=1250g
mCuSO4=1250-5·90=800g
8.
mH2SO4=200·0.049=9.8g
9.8g xg
H2SO4+CuO=CuSO4+H2O
98g 160g
x=9.8·160/98=16g
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