Предмет: Химия, автор: Gadelshina

при смешивании 1 кг воды и 2 кг 15%-ного раствора мочевины получится раствор с массовой долей мочевины :....%

пожалуйста, помогите решить.

Ответы

Автор ответа: NoRealName

0

1. Масса растворёного вещества

2*0,15=0,3кг

2. Масса раствора

1+2=3кг

3. Массовая доля

0,3/3=0,1=10%

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