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DBlessed
@DBlessed
August 2021
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Уважаемые,прошу,Помогите,хоть что-то,Химия 7 класс.
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krioira
CrO
Mr(CrO)=52+16=68
W(Cr)=52/68=0.765=76.5%
Cr2O3
Mr(Cr2O3)=2*52+3*16=152
W(Cr)=104/152=0.685=68.5%
7.
4Fe+3O2 = 2Fe2O3
Fe+S=FeS
2Fe+3Cl2=2FeCl3
8.
2C+O2=2CO
N2+O2=2NO
4Fe+3O2=2Fe2O3
10.
2
C2H6
+
7
O2
→
4
CO2
+
6
H2
O
11.
2 votes
Thanks 1
DBlessed
Это где,програмируйте пожалуйста.
krioira
это 9
DBlessed
ОК,спасибо,а то что в начале,не знаете?
DBlessed
7 которое
krioira
нет висит сейчас попробую
DBlessed
ок
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Answers & Comments
Mr(CrO)=52+16=68
W(Cr)=52/68=0.765=76.5%
Cr2O3
Mr(Cr2O3)=2*52+3*16=152
W(Cr)=104/152=0.685=68.5%
7.
4Fe+3O2 = 2Fe2O3
Fe+S=FeS
2Fe+3Cl2=2FeCl3
8.
2C+O2=2CO
N2+O2=2NO
4Fe+3O2=2Fe2O3
10.
2 C2H6 + 7 O2 → 4 CO2 + 6 H2O
11.