Предмет: Химия, автор: настя5684

помогите срочно пожалуйста

Приложения:

Ответы

Автор ответа: Stronghold

7А - 3

8А - 1

Дано:
Mr(NO₂) = 46 г/моль
Mr(2O) = 32 г/моль

ω(O) = (32 / 46 ) * 100% = 69,6%

Автор ответа: настя5684

погоми еще с этим

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: МХК, автор: danyakovylin08

на руси праздник входа господня в иерусалим называют вербным воскресеньем,
как вы думаете почему

5 лет назад

Предмет: Химия, автор: Аноним

С решением, пожалуйста
Молярная теплота выделяется при полном сгорании 1 моль вещества. Молярная теплота сгорания алканов линейно зависит от числа атомов углерода в молекуле и описывается уравнением: Q (n) = 100 +700n (кДж/моль), где n - количество атомов углерода в цеипи. При сгорании 0,2 моль неизвестного алкана Х линейного строения 440 кДж теплоты. Определите молекулярную формулу алкана Х. В ответ запишите молярную массу (г/моль) алкана Х. При расчёте выделилось атомные массы углерода и водорода округлите до целых чисел.

5 лет назад

Предмет: Английский язык, автор: Пусик25

Переведите на русский язык.
GREAT BRITAIN
The official name of the country is the United Kingdom of Great Britain and Northern Ireland. The total area is about 121 600 square miles. The largest islands are Great Britain proper (England, Scotland and Wales) and Ireland (Northern Ireland and the Irish Republic). Britain is separated from the continent by the English Channel which in its narrowest part is only 33 km wide. Britain has a generally mild and temperate climate. All over the world Britain was notorious for its fogs. The smoke-fogs of the big towns usually in winter time, were exceedingly unpleasant, unhealthy and dangerous to movement, but now the situation is much better.
The United Kingdom is a monarchy. The Monarchy is the most ancient secular institution in the United Kingdom. Queen Elisabeth II is a descendant of the Saxon king, Egbert. She acts only on the advice of her ministers. She reigns, but she does not rule. The Crown is the second biggest landowner in Britain. The Queen is the third richest woman in the world. Parliament is the supreme legislative authority in the United Kingdom. It consists of the House of Lords and the House of Commons. They are constituted on different principles, do different work in different places and meet only on occasions of symbolic significance such as the coronation and the opening of Parliament.
English people tend to be rather conservative - a little more so, perhaps, than most others. The conservative attitude consists of an acceptance of things which are familiar, and an important aspect of it is an inclination to be suspicious of anything that is strange or foreign. Conservatism on a national scale may be illustrated by reference to the public attitude to the monarchy. Apart from conservatism on a grand scale England is full of small-scale conservatisms: methods of cooking, the business of heating houses in which most English people remain strongly attached to the open fire.
England is highly industrialized and was the country in which the earliest developments of modern industry took place. Many of the great inventions which were the foundation of modern industrial processes are made by Englishmen or
Scotsmen. The original basis of British industry was coal mining. Nearly all English people live in towns, big or small.

5 лет назад

Предмет: Алгебра, автор: Аноним

ПРОГРЕССИЯ
Найдите 7-ой член последовательности yn=(n+2)/(n^2-13)

9 лет назад

Предмет: Математика, автор: dghjnjnh

Длина реки Волги 3690 км.Туристы прошли на лодках третью часть её длины.Сколько дней они плыли , если двигались со скоростью 6км/ч и ежедневно находились плавании по 5ч

9 лет назад