K2CO3+2HCl---->2KCl+H2O+CO2
a) n\(_{K2CO3}=\frac{27,6}{138}=0,2\left(mol\right)\)
Theo pthh
n\(_{CO2}=n_{K2CO3}=0,2\left(mol\right)\)--->m CO2=0,2.44=8,8(g)
V\(_{CO2}=0,2.22,4=4,48\left(l\right)\)
b) m dd=26,7+200-8,8=217,9(g)
Theo pthh
n\(_{KCl}=2n_{K2CO3}=0,4\left(mol\right)\)
C%=\(\frac{0,4.74,5}{217,9}.100\%=13,68\%\)
PTHH: K2CO3+2HCl---->2KCl+H2O+CO2
................0,2...........................................0,2(mol)
a) nK2CO3=27,6138=0,2(mol)
Theo pthh
--->m CO2=0,2.44=8,8(g)
Thể tích CO2(đktc):
VCO2=0,2.22,4=4,48(l)
b)Theo ĐLBTKL:
m dd=26,7+200-8,8=217,9(g)
Theo pthh
nKCl=2nK2CO3=0,4(mol)
mK2CO3=0,4.74,5=29,8(g)
Nồng độ phần trăm dd:
C%=\(\frac{29,8}{217,9}.100\%\approx13,68\left(\%\right)\)
#Walker