решите пожалуйста 9 и 10 задачи и уравнения реакций​

Ответ:

9.

дано

V(H2) = 6.5L

-----------------

m(Al)-?

2Al+3H2SO4-->Al2(SO4)3+3H2

n(H2) = V(H2) / Vm = 6.5 / 22,4 = 0.29  L

2n(Al) = 3n(H2)

n(Al) = 2*0.29 / 3 = 0.193mol

M(Al) = 27 g/mol

m(Al) = n(Al) * M(al)  = 0.193 * 27 = 25.11 g

ответ 25.11 г

10.

дано

m(ppa H2S) =150 g

W(H2S) =75%

-------------------------

m(PbS) -?

m(H2S) = 150 * 75% / 100% = 112.5 g

Pb+H2S-->PbS+H2

M(H2S) = 34 g/mol

n(H2S) = m/M = 112.5 / 34 = 3.31 mol

n(H2S) = n(PbS) = 3.31  mol

M(PbS) = 239 g/mol

m(PbS) = n(PbS) * M(PbS) = 3.31 * 239 = 791.09 g

ответ 791.09 г

6.

2Сu+S-->Cu2S

6Na+2H3PO4-->2Na3PO4+3H2

2Fe+3Br2-->2FeBr3

2N2+O2-->2N2O

CaCO3-->CaO+CO2

Объяснение: