1)Na + H3PO4→
2)CaCO3 + HCl→
3)NaOH + H2SiO3→
4)MgO + HBr→
5)Mn + H2SO4→
6)Fe(OH)2 + HCl→
7)Na2CO3 + HNO3→
8)CaO + H2S→

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Объяснение:

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1) а) Ca-CaO-Ca(OH)2

2Са + О2 = 2СаО

СаО + Н2О = Са(ОН)2

б) Se-SeO2-H2SeO3

Se + O2 = SeO2

H2O + SeO2 = H2SeO3

2)

Дано: m(H2O)  = 6 г

Найти: V(SO2) - ?

х моль  0,33 моль

SO2 + H2O = H2SO3

1моль 1 моль

n = m/M

M(H2O) = 18 г/моль

n(H2O) = 6 г / 18 г/моль = 0,33 моль

n(H2O) = n(SO2) = 0,33 моль

V = n*Vm

V(SO2) = 0,33 моль * 22,4 дм3/моль = 7,392 дм3

ответ: 7,392 дм3 (или 7,392 л)

3)

Дано: n(Na) = 0,1 моль

Найти: m(NaOH) -?

0,1 моль       х моль

4Na + O2 = 2Na2O

4 моль         2 моль

0,1 = х

  4     2

х = 0,05

n(Na2O) = 0,05 моль

0,05 моль         х моль

Na2O + H2O = 2NaOH

1 моль               2 моль

0,05 = х

   1     2

х = 0,1

n(NaOH) = 1 моль

m = n*M

M(NaOH) = 23 + 16 + 1 = 40 г/моль

m(NaOH) = 1 моль * 40 г/моль = 40 г

  ответ: 40 г