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3 years ago

How many grams do 3.6 x10^20 atoms of silicon weigh?

Chemistry

1 answer:

creativ13 [48]3 years ago

4 0

First, we divide the number of atoms of silicon given in the problem above by Avogadro's number 6.6022 x10^23. This will give us the number of moles of silicon. Then, we multiply the number of moles by the molar mass of silicon.
number of moles = (3.6 x 10^20 atoms/6.022x10^23 atoms) = 5.97x10^-4 moles
Then, multiplying by the molar mass
(5.97x10^-4 moles)(28.0855 g/mol) = 0.017 grams

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3 years ago

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Answer:

The energy lost by the water is given by:

where

m = 3.0 kg = 3000 g is the mass of water

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The energy added to the aluminium is given by:

where

m = 0.30 kg = 300 g is the mass of aluminium

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4. 42.9 g

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where

is the heat added

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where

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3 years ago

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Answer:

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Explanation:

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3 years ago

Dalton's law of partial pressures states that the total pressure exerted by a mixture of gases is the sum of the pressures exert

Damm [24]

Answer: The given statement is true.

Explanation:

According to the Dalton's law, total pressure of a mixture of gases that do not react with each other is equal to the partial pressure exerted by each gas.

The relationship is as follows.

$p_{total} = \sum_{i=1}^{n} p_{i}$

or, $p_{total} = p_{1} + p_{2} + p_{3} + p_{4} + ......... + p_{n}$

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Also, relation between partial pressure and mole fraction is as follows.

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3 years ago