Ответы
1)
дано
m(Cu2(OH)2CO3) = 444 g
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m(CuO)-?
m(CO2)-?
m(H2O)-?
Cu2(OH)2CO3-->2CuO+H2O+2CO2
M(Cu2(OH)2CO3) = 222 g/mol
n(Cu2(OH)2)CO3) = m/M = 444 / 222 = 2 mol
n(Cu2(OH)2)CO3) = n(H2O) = 2 mol
M(H2O) = 18 g/mol
m(H2O) = n*M = 2*18 = 36 g
n (Cu2(OH)2)CO3) = 2n(CuO) = 2n(CO3)
n(CO3) = 2*2 = 4 mol
M(CuO) = 80 g/mol
m(CuO) = n*M = 80*4 = 320 g
n(CO2) = 2*2 = 4 mol
M(CO2) = 44 g/mol
m(CO2) = n*M = 4* 44 = 176 g
ответ 320 г, 176 г, 36г .
2)
дано
m(Fe) = 28 g
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m(Fe3O4)-?
Fe3O4+4H2-->3Fe+4H2O
M(Fe) = 56 g/mol
n(Fe) = m/M = 28 / 56 = 0.5 mol
n(Fe3O4) = 3n(Fe)
n(Fe3O4) = 0.5 / 3 = 0.17 mol
M(Fe3O4) = 232 g/mol
m(Fe3O4) = n*M = 0.17 * 232 = 39.44 g
ответ 39.44 г
3)
дано
m(KCLO3) = 1.225 g
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m(KCL)-?
m(O2)-?
2KCLO3--t-->2KCL+3O2
M(KCLO3) = 122.5 g/mol
n(KCLO3) = m/M = 1.225 / 122.5 = 0.01 mol
2n(KCLO3) = 2n(KCL) = 0.01 mol
M(KCL) = 74.5 g/mol
m(KCL) = n*M = 0.01*74.5 = 0.745 g
2n(KCLO3) = 3n(O2)
n(O2) = 3*0.01 / 2 = 0.015 mol
M(O2) = 32 g/mol
m(O2) = n*M = 0.015 * 32 = 0.48 g
ответ 0.745 г , 0.48 г
4)
дано
m(Zn) = 26 g
----------------------
m(HCL)-?
n(HCL)-?
M(Zn) = 65 g/mol
n(Zn) = m/M = 26 / 65 = 0.4 mol
2HCL+Zn-->ZnCL2+H2
2n(HCL) = n(Zn)
n(HCL) = 2*0.4 = 0.8 mol
M(HCL) =36.5 g/mol
m(HCL) = n*M =0.8 * 36.5 = 29.2 g
ответ 29.2 г , 0.8 моль