Предмет: Химия, автор: maksim1kuzaev

СРОЧНО ПОМОГИТЕ
прореагували розчин барій гідроксиду масою 200г з масовою часткою лугу 15% та сульфатна кислота. Визначте масу осаду

Ответы

Автор ответа: dyexfnf
0

Ответ:

Объяснение:

Дано:

m(р-нBa(OH)2) = 200

w(Ba(OH)2) = 15% або 0,15

Найти: m(BaSO4) - ?

М(Ba(OH)2) = 137 + (16 + 1) * 2 = 171 г/моль

М(BaSO4) = 137 + 32 + 16 * 4 = 233 г/моль

Знайдемо масу Ba(OH)2 в розчині:

m(Ba(OH)2) = m(р-нBa(OH)2) * w(Ba(OH)2) = 200 * 0,15 = 30 г

Складемо РХР:

   30 г                            х г

Ba(OH)2 + H2SO4  = BaSO4↓ + 2H2O

n = 1 моль                  n = 1 моль

M = 171 г/моль           M = 233 г/моль

m = 171 г                     m = 233 г

30 г(Ba(OH)2)   -  х г(BaSO4)

171 г (Ba(OH)2)  -  233 г (BaSO4)

m(BaSO4) = 30 * 233 : 171 = 40,88 г

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