Наблюдая за кораблями, скрывающимися за линией горизонта, древние греки выдвинули гипотезу, что Земля круглая. Какой опыт может подтвердить
nbatagova2005
3
16.04.2019 23:10
14 
Популярные вопросы
- There are some linking expressions that can be used while writing a composition....
2 - Nelly and Tom are asking their American friends about American celebrations....
1 - Karen Hewitt wrote the book Understanding Britain where she gives some useful...
2 - Why do the teenagers think that their countries are great? ... thinks that......
1 - Which behaviour rules do British people follow? Use the words from the box to...
1 - Jessica, an American, and Liz, a British girl, are watching the Chinese New...
3 - Answer the questions. • Where does the main London Christmas tree come from...
3 - Listen to the information about the 3 celebrations. For questions 1-9, circle...
2 - Pair work. You are talking to your American friend about holidays that are popular...
3 - Behaviour rules may be different in different countries Complete the sentences....
1
CH3-COOH + NaOH -> CH3-COONa + H2O
2) Определяем кол-во вещества гидроксида натрия:
n(NaOH) = m(NaOH) : M(NaOH) = 120 г : 40 г\моль = 3 моль
3) Определяем массу уксусной кислоты:
n(CH3-COOH) = n(CH3-COOH) = 3 моль
m(CH3-COOH) = M(CH3-COOH) * n(CH3-COOH) = 60 г\моль * 3 моль = 180 г
ответ: m(CH3-COOH) = 180 г
M(NaOH) = 23+16+1= 40 г/моль
n(NaOH) = m/M = 120/40 = 3 моль
n(CH3COOH) = n(NaOH) = 3 моль
M(CH3COOH) = 12+3+12+16+16+1 = 60 г/моль
m(CH3COOH) = n*M = 3*60 = 180 г