Предмет: Химия, автор: loll3221

Помогите пожалуйста, 2, 4 и 5
Умоляю

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Ответы

Автор ответа: fffdghki56
1
Упражнения 5:
Mr( MgCl2 ) = 24+35•2=94
Mr ( Al2O3 ) = 27•2+16•3=102
Mr ( Fe(OH)3) = 56+16•3+1•3=107
Mr ( K2Cr2O7 ) = 39•2+52•2+16•7=294
Mr ( SO3 ) = 32+16•3=80
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