Предмет: Химия, автор: Lellu15

ПОМОГИТЕ
250 г раствора где содержится 20% соли упарили до 25% соли найти массовую долю воды которая ушла при выпаривание.

Ответы

Автор ответа: iskatel1

m (в-ва) = 0,2*250=50 г
после выпаривания:
m(р-ра)= 50/0,25= 200 г
250 г - первоначальная масса р-ра
200 г - масса р-ра после выпаривания
250-200=50 г - масса воды, которую выпарили

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Алгебра, автор: lunyovand

4(x+1)=15(x-2)-12x помогите

7 лет назад

Предмет: Математика, автор: dmitrovolosin30

Допоможи кнопочку і розв'язати задачу на рух

7 лет назад

Предмет: Английский язык, автор: vikavandzhura51

Допоможіть з англійською. Put the verbs in brackets in the correct past tense.
Anita Roddick, founder of the Body Shop, was born in England in 1942. In the 1960s, she ________ 1 (train) as a teacher in England and _________ 2 (work) for the United Nations in Geneva. She then __________ 3 (decide) to adopt a ‘hippie’ lifestyle and __________ 4 (begin) to travel extensively.
While she _______ 5 (travel) around the world, she ________ 6 (learn) many different customs and rituals from many different countries and ________ 7 (become) interested in anthropology.
In 1971, she married Gordon Roddick. They ran a small hotel and restaurant in Brighton, but after three years they decided they _________ 8 (want) a different way of life for themselves and their two children.
While her husband ________ 9 (travel) in the USA IN 1976, Anita _________ 10 (open) the first Body Shop, selling natural, environment-conscious cosmetics ________ 11 (enquire) how they could start their own branch of the Body Shop.
Anita and Gordon then ________ 12 (develop) a new business philosophy: profits with principles. It was clear the Body Shop was a cosmetics company with a difference: they ________ 13 (want) to see social and environmental changes. They _________ 14 (launch) unusual advertising campaigns, and ________ 15 (support) a number of environmental and human rights organizations.

7 лет назад