2Na+H2SO4=Na2SO4+H2
n=m/M(Mr) M=Mr Mr(H2SO4)=98 M=98
n(H2SO4)=11,5/98=0,12( моль)
n(H2SO4)/n(Na2SO4)=1/1 n(Na2SO4)=0,12 моль
m=n*M(Mr) M=Mr Mr(Na2SO4)=142
M=142г/моль
m(Na2SO4)=0,12*142=17,04(г)
Ответ: 17,04 г
Mr(Na2s)=23*2+32=78
W(na2)=23*2/78*100%=58,97%
W(S)=32/78*100%=41,02%
Mr(MgSO4)=24+32+16*4=120
W(Mg)=24/120*100%=20%
W(S)=32/120*100%=26,66%
W(O4)=16*4/120*100%=53,33%
1)Ch2=CH(ch3)-Ch2-Ch2-Ch2-Ch2
2)Ch2=Ch2-Ch(CH3)-Ch2-Ch3
3)Ch3-C(CH3)=Ch-Ch(c2h6)-Ch2-Ch3