Да правда!
Объяснение:
Объяснение:
1)
M(KMnO4) = 39 + 55 + 16*4=39 + 55 + 64 = 158 г/моль
W(K) = 39/158*100% = 24,7%
W( Mn) = 55/158 * 100% = 34,8%
W(O) = 64/158 * 100% = 40,5%
2)
M(Al2(SO4)3) = 27*2 + 32*3 + 16*12 = 54 + 96 + 192 = 342 г/моль
W( Al) = 54/342 *100% = 15,8%
W( S) = 96/342*100% = 28,1%
W( O) = 192/342 *100% = 56,1%
3)
M(MgCl2) = 24 + 35,5*2 = 24 + 71 = 95 г/моль
W( Mg) = 24/95*100% = 25,3%
W( Cl) = 71/95*100% = 74,7%
4)
M(FeSO4) = 56 + 32 + 16*4 = 56 + 32+ 64 = 152 г/моль
W( Fe) = 56/152*100% = 36,8%
W(S) = 32/152*100% =21,1 %
W(O) = 64/152*100% = 42,1%
5)
M(CH3COONa) = 12*2 + 1*3 + 16*2 + 23 = 24 + 3 + 32 + 23 = 82 г/моль
W(C) = 24/82*100% = 29,3%
W(H) = 3/82*100% = 3,7%
W(O) = 32/82*100% = 39%
W(Na) = 23/82*100% = 28%
согласен
Объяснение:
тут можно и без объяснения