2CIO+H2O2=HCIO3+H2O <span> ...................................
</span>
Mr(Li2O) =14+16 = 30
Mr(Na2O) = 46 +16 = 62
Mr(K2O) = 94
Mr( Rb2O) = 186
Mr(Сs2O) = 282
C6H5-CH=CH2 +Br2⇒C6H5-CHBr-CH2 Br
Al2O3 + 3H2SO4 = Al2(SO4)3 + 3H2O
M(Al2O3) = 54+48 = 102 г/моль
M(Al2(SO4)3 = 342 г/моль
m(Al2(SO4)3 (теоретически) = 2,565 / 0,75 = 3,42 г
n(AL2(SO4)3 = 3,42 / 342 = 0,01 моль
n(Al2O3) = n(Al2(SO4)3 =0,01 моль
m(Al2O3) = 0,01*102 = 1,02 г