Предмет: Химия, автор: Свит

какой объем аммиака (н.у.) образуется при нагревании смеси, состоящей из 20 г хлорида аммония и 20 г гидроксида кальция?

Ответы

Автор ответа: mimino34

0

20г 20г t хл

1) 2NH4Cl + Ca(OH)2 = CaCl2 + 2NH3 + 2H2O

2*53,5г/моль 74г/моль 2*22,4л

2)n(NH4Cl)=m/M=20г/107г/моль=0,2моль

3)n(Ca(OH)2)=20г/74г/моль=0,3моль

4) NH4Cl в недостатке,значит,вычисления проводим по этому веществу(0,2<0,3)

5)20г(NH4Cl)---------------xл(NH3)

V(NH3)=(20*44,8)/107=8,4л.

107г/моль(NH4Cl)------44,8л(NH3)

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Everything you should know about Leonardo da Vinci and the Mona Lisa

It’s the most famous work of art on the planet. The Mona Lisa is also known

as La Gioconda.

Leonardo da Vinci painted it between 1503 and 1506. We know that the

painting was special to Leonardo because he spent so long working on it. In one of

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Leonardo di ser Piero da Vinci (his full name) was born in 1452, the son of a

lawyer in the Tuscan town of Vinci. He didn’t have a classical education but became

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years there, learning and working with other important painters such as Sandro

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He was a vegetarian.

Apart from being an artist, Leonardo was an engineer, inventor and

philosopher. He also loved geology, anatomy and astronomy. As a scientist, he was

ahead of his time.

He died in France in 1519, aged 67.

We don’t have any final proof of the identity of the woman in the painting.

Most people agree that it is a portrait of Mona Lisa, who married Francesco di

Bartolomeo di Zanoli del Giocondo in 1495. The title La Gioconda comes from his

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There have been theories that the portrait is of Leonardo’s vision of an ideal

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It was painted on a thin backing of wood, which is now extremely fragile. This

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The painting was acquired by François I of France. He knew Leonardo when

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The painting remained in French royal collections from the beginning of the

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63

The Mona Lisa was stolen from the Louvre on 21 August, 1911. An Italian

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people of France have sent to the United States and, though she will not stay with us

as long as the Statue of Liberty, our appreciation is equally great.”

The Mona Lisa is housed at the Louvre in Paris.

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The Mona Lisa was painted around _____________________________(1)

years ago. The other name for the Mona Lisa is

_____________________________(2), which is based on her husband’s

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_____________________________(13).

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