Ответы на вопрос:
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:
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