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Anuta_ua [19.1K]
3 years ago
13

Who uses chemicals ?

Chemistry
2 answers:
nordsb [41]3 years ago
4 0
Is there answer choices ??
bogdanovich [222]3 years ago
3 0
Well, a chemist is a scientist that studies chemistry. A chemist can use chemicals to demonstrate chemical reactions and things like that, right? So, an example of a person who uses chemicals is a chemist. Hope this helped!
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When copper metal is added to nitric acid, the following reaction takes place
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Answer:

The volume of NO₂ gas collected over water at 25.0 °C is 1.68 Liters.

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Cu (s) + 4 HNO_3 (aq) \rightarrow Cu(NO_3)_2 (aq) + 2 H_2O (l) + 2 NO_2 (g)

Moles of copper = \frac{2.01 g}{63.55 g/mol}=0.03163 mol

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Then 0.03613 moles of copper will give:

\frac{2}{1}\times 0.03163 mol=0.06326 mol of nitrogen dioxide gas

Moles of nitrogen dioxide gas = n = 0.06326 mol

Pressure of the gas = P

P = Total pressure - vapor pressure of water

P = 726 mmHg - 23.8 mmHg = 702.2 mmHg

P = 0.924 atm (1 atm = 760 mmHg)

Temperature of the gas = T = 25.0°C =298.15 K

Volume of the gas = V

PV=nRT

V=\frac{0.06326 mol\times 0.0821 atm L/mol K\times 298.15 K}{0.924 atm}

V = 1.68 L

The volume of NO₂ gas collected over water at 25.0 °C is 1.68 Liters.

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