Рассчитайте объем ацетилена, который может быть получен из 128 г карбида кальция, содержащего 5% примесей, если выход ацетилен асоставляет 80% от теоретически возможного. , напишите мне дано к этой , решение не надоо, только дано: )!
Ответы на вопрос:
дано: m(cac2)с примесями=128 г
w(примесей)cac2=5%
ню=80%(ню это типа "n",только правая палочка продлена вниз)
найти: v(c2h2)
The history of the Internet
It’s history
The Internet started in the 1960s. The United States Department of Defense started it because they wanted a computer network to help the American military. In the 1970s scientists worked on it.
Then in the 1980s telephone companies made in possible to communicate on the computer network in many more countries. An international computer language was born, and the Net went worldwide.
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