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3 years ago

1.

Chemistry

2 answers:

Tresset [83]3 years ago

6 0

Answer:

A sample of water boils and releases gas.

Explanation:

Physical change is a change where no any chemical reaction takes place only the chemical composition of matter changes. It is a reversible process .

Burning of newspaper, rusting of iron, plant changes carbon dioxide and water into sugar (photosynthesis) are chemical reaction and irreversible process.

ivann1987 [24]3 years ago

4 0

Answer: A sample of water boils and releases gas.

Explanation: When water boils it evaportates but it is still water so this is a psysical change

Hope this helps !

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Oksanka [162]

Answer : The mass of $NaN_3$ required is, 166.4 grams.

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First we have to calculate the moles of nitrogen gas.

Using ideal gas equation:

$PV=nRT$

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V = Volume of $N_2$ gas = 113 L

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T = Temperature of $N_2$ gas = $85^oC=273+85=358K$

Putting values in above equation, we get:

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Now we have to calculate the moles of sodium azide.

The balanced chemical reaction is,

$2NaN_3(s)\rightarrow 2Na(s)+3N_2(g)$

From the balanced reaction we conclude that

As, 3 mole of $N_2$ produced from 2 mole of $NaN_3$

So, 3.84 moles of $N_2$ produced from $\frac{2}{3}\times 3.84=2.56$ moles of $NaN_3$

Now we have to calculate the mass of $NaN_3$

$\text{ Mass of }NaN_3=\text{ Moles of }NaN_3\times \text{ Molar mass of }NaN_3$

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