Предмет: Химия, автор: diliastapenko

как найти химическое количество вещества?
объясните пожалуйста кто может​

Ответы

Автор ответа: kotenochek9
2

Ответ:

Пример

определи число молекул в воде химическим количеством 10 моль.

Подставим химическое количество воды в формулу:

N(H2O)=n(H2O)⋅Na=10⋅6,02⋅1023=60,2⋅1023 молекул.

Ответ: в воде химическим количеством 10 моль содержится 60,2⋅1023 молекул.

По известному числу частиц можно вычислить химическое количество вещества:

n=NNa .

Пример:

вычисли химическое количество оксида кальция CaO в порции, содержащей 3,01⋅1023 формульных единиц.

Подставим число частиц в формулу и вычислим химическое количество CaO :

n=N(CaO)Na=3,01⋅10236,02⋅1023=0,5 моль.

Ответ: химическое количество оксида кальция CaO равно 0,5 моль.

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Варианты:appeared,choral,composer,conductor,continue,first night ,full houses,influenced,masterpiece,symphony,took place,tuneless and complicated

D.Shostakovich was born on 25 September .1906 in St Petersburg. His father was an engineer and his mother was a pianist and give him his first piano lessons. When he was 13 he became a pupil of the famous- Alexander Glazunov at the Petrograd Conservatoire, Shostakovich was happy because he liked Glazunov’s music a lot. D.Shostakovich wrote his first –in 1925 and it was performed all over the world. Every year until he died Shostakovich celebrated its – as the moment when his life changed forever . Shostakovich’s second Symphony- in 1927. It was an experimental work with a- ending when the choir sang «To October « by Alexander bezymensky . In the years of the Great Terror (in the late 1930s) his music was criticized, the critics said it was - .In December 1941 ,D. Shostakovich (who lived in besieged Leningrad) wrote his most famous “Leningrad Symphony”. It is a real -. Its first night – in the besieged city in 1942.
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