(2)Al+(3)F2=(2)AlF3
Al2O3+HF=(2)AlF3+(3)H2O
(3)Be<span> + </span><span>N2</span><span> → </span><span>Be3N2
</span>(3)BaH2+N2=Ba3N2+(3)H2
CxHyClz
Mr(CxHyClz) = 2,707*29 = 78,5
x = (78,5*45,86)/(12*100) = 3
y = (45,22*78,5)/(35*100) = 1
z = (8,92*78,5)/(1*100) = 7
Ответ: C₃H₇Cl.
1)Ba(OH)2 + 2HCl = BaCl2 + 2H2O
Ba(+2) + 2OH(-) + 2H(+) + 2Cl(-) = Ba(+2) + 2Cl(-) + 2H2O
2OH(-) + 2H(+) = 2H2O
2) Ba(OH)2 + CO2 = BaCO3 + H2O
Ba(+2) + 2OH(-) + CO2 = BaCO3 + H2O
3) Ba(OH)2 + H2SO4 = BaSO4 + 2H2O
Ba(+2) + 2OH(-) + 2H(+) + SO4(-2) = BaSO4 + 2H2O
4) Ba(OH)2 + SO3 = BaSO4 + H2O
Ba(+2) + 2OH(-) + SO3 = BaSO4 + H2O
1Б, 2А, 3В, 4Б, 5Б.
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