Уравнение реакции:
CaCl2+Na2CO3=CaCO3+2NaCl
Так как указано количество только соды, считаем что хлорид кальция находится в избытке или стехиометрическом соотношении и расчет количества продукта реакции рассчитываем по соде.
Атомный вес натрия Na=23
Атомный вес углерода С=12
Атомный вес кислорода О=16
Атомный вес кальция Ca=40
Молярный вес кальцинированной соды Na2CO3=23*2+12+16*3=106
Молярный вес карбоната кальция CaCO3=40+12+16*3=100
Мы взяли 200 граммов 5,3% раствора соды. Проценты - это количество вещества в 100 граммах смеси.
Таким образом мы взяли 200*5,3/100=10,6 граммов чистой 100% соды.
Теперь составляем пропорцию с учетом стехиометрических коэффициентов:
106 - 100
10,6 - Х
Х=10,6*100/106=10 граммов соды.
ответ: в результате данной реакции мы получим 10 граммов карбоната кальция.
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Объяснение:
Объяснение:
написать пересказ на 7-10 предложений, очень нужно .
Gandhi was born Mohandas Karamchand Gandhi in India on
2nd October, 1869 into a merchant family. When he was 19, Gandhi
broke with tradition and left India to study Law in London. Then, in
1891, he accepted a job at an Indian law firm in Durban, South Africa,
where he remained for twenty years. Gandhi was shocked by the
discrimination against Indian immigrants in South Africa and headed a
campaign for their civil rights. During this time, Gandhi developed his
principle of 'satyagraha' which means 'devotion truth' through non-
violent action. Gandhi was sent to prison many times for leading
peaceful campaigns of civil disobedience. Before he left the country,
though, the South African government made many of the changes he
had called for.
In 1914, Gandhi returned to a troubled India which was
occupied by the British Empire. Gandhi felt that India could never truly
be free as long as it remained under British rule. He wanted to work
towards Indian independence and create greater understanding
between all classes and religious faiths across the country. In 1919, he
joined the new Indian National Congress Party and launched a policy of
peaceful non-cooperation with the British, including a boycott of British
goods and institutions. One of Gandhi's most famous protests was
against the tax on salt imposed by the British authorities. He led
thousands of people on a 320 km 'march to the sea' to make their own
salt from seawater. Because of his various campaigns, Gandhi was
imprisoned four times: in 1922, 1930, 1933 and 1942.
Nevertheless, as a result of Gandhi's talks and negotiations
with the British government, India won independence in 1947.
However, there remained fierce tension between different religious
groups in the country. On 30th January 1948, Gandhi, then aged 78,
was assassinated. The assassin could not accept Gandhi's belief that all
faiths were of equal value. Gandhi was on his way to a prayer meeting
when he was shot three times in the chest.
Gandhi maintained his life-long belief in peace, non-violence
and that all people were created equally. His beliefs informed all areas of
his life; in meetings he always wore the simple clothes of an Indian
villager, while the politicians around him dressed in formal suits. He also
followed a vegetarian diet and lived a simple life. In India, he was called
'Mahatma' Gandhi which means 'great soul'. There, his birthday is
celebrated as an official holiday and also as an international day of non-
violence. Gandhi spoke to everybody, everywhere when he said, "Be the
change you want to see. " And indeed, his achievements remain an
inspiration to people all over the world; his life truly was his message.
