Продуктом взаимодействия данных веществ будет азид натрия:
2Na + 3N2 = 2NaN3 (не забываем расставлять коэффициенты для последующих правильных расчётов);
Через данный нам объём азота мы можем найти количество его моль(n):
n(N2) = V : Vm(объём молярный) = 6,72 л : 22,4 л/моль = 0,3 моль (22, 4 л - величина постоянная и одинаковая для всех газов при нормальных условиях).
Азида натрия в 1,5 раза меньше, чем азота (3 : 2 = 1,5 , исходя из коэффициентов), поэтому n(NaN3) = 0,3 моль : 1,5 = 0,2 моль.
Остаётся найти массу NaN3:
m(NaN3) = n(NaN3) * M(NaN3) = 0,2 моль * 65 г/моль = 13 г .
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помогите пж 11 класс английский язык
8 Complete the second sentence so that it has a similar meaning to the first sentence. Use the word given.
1 If you saw a celebrity on the street, would you ask for an autograph?
IF
What ____________________________ on the street? Would you ask for an autograph?
2 I wouldn’t visit Egypt in the summer.
UNLESS
I would ____________________________ summer.
3 If there isn’t much traffic, we can make the 8 o’clock movie.
AS
We can make the 8 o’clock movie ____________________________ traffic.
4 I will call everyone about the party unless you don’t want me to.
IF
I will call everyone _____________________________ me to.
5 Jonathan will bring the food if you ask him to.
UNLESS
Jonathan won’t ____________________________________ him to.
4 Choose the correct answer. My cousin was always a good athlete and very strong. When he was a teenager, his dad advised him to 1) ____ boxing. He loves it. While other kids are 2) ____ at the mall, my cousin goes to the gym and 3) ____ for hours. Last weekend he had a match against the city champion in his age group. My cousin hadn’t 4) ____ on time and I thought maybe he wasn’t going to come. He was just late because of traffic. It was a very exciting match and my cousin won! He 5) ____ his opponent in the 3rd round!
1 a take up b make up c turn up
2 a hanging out b knocking out c working out
3 a turns up b plays out c works out
4 a turned up b worked up c hanged up
5 a hung out b knocked out c dropped out
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