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Tems11 [23]
3 years ago
9

Which of the following has helped preserve resources while cutting the demand for energy?

Chemistry
2 answers:
sweet [91]3 years ago
4 0
A is the correct answer
Mekhanik [1.2K]3 years ago
3 0

Answer: Option (D) is the correct answer.

Explanation:

When there is minimum use of energy and we are still able to preserve resources then it means we are cutting the demand for energy.

Therefore, when we are treating water with chlorine then it means without any electricity or energy we are cleaning the water. But at the same time chlorinated water is harmful to use unless chlorine is dissolved in limiting quantity.

Whereas energy efficient appliances will use the electricity efficiently.

Landfill will require the use of machines or man power therefore, energy will be used.

On the other hand, when rules are framed against the use of chlorofluorocarbons then there will be lesser depletion of ozone layer. Hence, use of energy will be minimum.

Thus, we can conclude that legislation against the use of chlorofluorocarbons has helped preserve resources while cutting the demand for energy.

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When copper metal is added to nitric acid, the following reaction takes place
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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)

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According to reaction, 1 mol of copper gives 2 moles of nitrogen dioxide gas.

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

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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

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

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

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