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Рассчитайте количество частиц, содержащихся: а) в 100г воды; б) в 3г сахарозы.
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Предмет:
Химия -
Автор:
oscargibson - 5 лет назад
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Ответы 1
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Кол-во вещества на постоянную Авогадро умножаешь,и готово.Кол-во вещества,если что,по формуле : n=m/M (масса/молярная масса).Постоянная Авогадро: 6,02 * 10^23 - вперед:)
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Автор:
jaimejennings - 5 лет назад
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Пожайлусто помогите решить 30y-20y=280, 28-3x=10, m+6m-5=72, 7y-35=21, 487+17x=589, 138+x+57=207, (28-9x)=10, (x+15)*8=160, 28-(5x-11)=12
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Предмет:
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Автор:
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- найдите корни уравнение x2-13x+42=0 с объяснением
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Переведите, пожалуйста
Great Britain is the name of the largest island of the British Isles and it ts made up of England. Scotland and Wales, it doesn't include Northern Ireland. Geographically, the island of Great Britain is subdivided into two main regions — Lowland Britain and Highland Britain. Lowland Britavi comprises southern and eastern England. Highland Britain consists of Scotland, most of Wales, tho Pennines. and the Lake District. The Pennine Chain extends southward from tho Cheviot Hills into the Midlands. The chief rivers of Great Britain are: the Severn, the Avon, the Thames and some others There are many lakes in Great Britain. The coasts of England are washed by the North Sea the Irish Sea. the English Channel and the Strait of Dover. Scotland includes the Hebrides off the west coast, and the Orkney and Shetland Islands off the north coast. It is bounded by the North Sea in the east. The Highlands of Scotland are among the oldest mountains in the world Most of the population of Scotland is concentrated in the Lowlands. Here on the Ctyde. ts Glasgow. Scotland's biggest city. Wales is a highland country of old. hard rocks. North Wales It a country of mountains and deep valleys. South Wales is a land of high hills and wide valleys. The pride of Wales in scenery is Snowdonia. a region of high mountains. Snowdoo is the highest mountain in England and Wales.-
Предмет:
Английский язык -
Автор:
araceli - 5 лет назад
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Ответов:
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- разложить на множители xy-y^2-x^2+y^2
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