Предмет: Химия, автор: sydorenkosr

допоможіть!!!!!!!!!!!!!!!!!!!!!!!!!!!

Приложения:

Ответы

Автор ответа: dobriakua
1

Задача 2

Дано:

CxHy

ω(C) = 84,21%

ω(H) = 15,79%

D пов.(CxHy) = 3,93

Знайти:

CxHy - ?

Розв'язання:

1) M(CxHy) = D пов.(CxHy) * M(пов.) = 3,93 * 29 = 114 г/моль;

2) N(C) = (ω(C) * Mr(CxHy)) / (Ar(C) * 100%) = (84,21% * 114) / (12 * 100%) = 8;

3) N(H) = (ω(H) * Mr(CxHy)) / (Ar(H) * 100%) = (15,79% * 114) / (1 * 100%) = 18;

4) C8H18.

Відповідь: Невідома речовина - C8H18.

Задача

Дано:

CxHyOz

ω(C) = 40%

ω(H) = 6,67%

M(CxHyOz) = 90 г/моль

Знайти:

CxHyOz - ?

Розв'язання:

1) ω(O) = 100% - ω(C) - ω(H) = 100% - 40% - 6,67% = 53,33%;

2) N(C) = (ω(C) * Mr(CxHyOz)) / (Ar(C) * 100%) = (40% * 90) / (12 * 100%) = 3;

3) N(H) = (ω(H) * Mr(CxHyOz)) / (Ar(H) * 100%) = (6,67% * 90) / (1 * 100%) = 6;

4) N(O) = (ω(O) * Mr(CxHyOz)) / (Ar(O) * 100%) = (53,33% * 90) / (16 * 100%) = 3;

5) C3H6O3.

Відповідь: Невідома речовина - C3H6O3.

Похожие вопросы
Предмет: Английский язык, автор: markdobroskokin
WIDER WORLD ENGLISH FOR SPEAKING 5 Choose the correct words from the box to complete the questions and answers. There are five extra words. do fan for free hang have in interesting interests into it make not on play Question What are your hobbies and ¹ Julie? What do you do in your time? Are you a big of skateboarding? Are you keen'. football? Do you of running? a lot Answer Oh, 12 basketball. 14 friends. a lot of out with my 6 really-I No, prefer mountain biking. No, I'm not very interested Yes, I'm really into 10 it. /10 ENGLISH IN USE 6 Robert made this list of things he did and when he did them on 31 December 2017 at 4 p.m. When did I ... 1. run my first race? win my first cup? go for my last run? 2 3 4 5 6 7 8 9 10 8 UNIT 6: Language Test GROUP A 9 drink a glass of water? buy new running shoes? 10 call my girlfriend? ... see a film at the cinema? 6 I called my girlfriend 7 start running every day? .. visit my grandparents? *** stop eating unhealthy food? Complete these sentences for Robert using time expressions (year, month, week, etc.) with ago. Imagine it is still 4 p.m. on 31 December 2017. You also need to add the Past Simple of the verb for questions 7-10. 1 I ran my first race 2 I won my first cup_ 3 I went for my last run 4 I drank a glass of water_ 5 I bought new running shoes When December 2015 31 October 2017 2 p.m. today 3.45 p.m. today 17 December 2017 4 p.m. yesterday 30 November 2017 December 2016 24 December 2017 30 June 2017 a film at the cinema running every day my grandparents eating unhealthy food /10​
Предмет: Алгебра, автор: cernovak593
Предмет: Математика, автор: tursumbekovo