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Sidana [21]
3 years ago
9

What is the formula for calculating the efficiency of a heat engine?

Chemistry
2 answers:
deff fn [24]3 years ago
6 0

Answer: The correct answer is Efficiency= \frac{W}{Q_{H}}.

Explanation:

Heat engine: It is a device which converts the heat energy in to the mechanical work. In heat engine, the heat is transferred from high temperature reservoir to the low temperature reservoir.

It is just opposite of the refrigeration.

The expression of the work done is as follows;

W=Q_{H}-Q_{C}

Here, Q_{H} is the heat added to the system and Q_{C} is the heat rejected to the cold reservoir.

The formula for calculating the efficiency of a heat engine is as follows;

Efficiency= \frac{W}{Q_{H}}

Here, W is the work done and Q_{H} is the heat added from the reservoir which is at high temperature and Q_{C} is the heat rejected to the reservoir which is at low temperature.

mihalych1998 [28]3 years ago
5 0
Hi there,


Efficiency=. Work
——————-
Heat energy

We know that all the energy that is put into the engine has to come out either as work or waste heat. So work is equal to Heat at High temperature minus Heat rejected at Low temperature.
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The question is incomplete.

The complete question probably is

The pH scale for acidity is defined by pH = − log₁₀[H⁺] where [H⁺] is the concentration of hydrogen ions measured in moles per liter (M). A solution has a pH of 2.55. Find the hydrogen ion concentration.

Answer: -

0.003 M

Explanation: -

pH = − log₁₀[H⁺]

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What is the term for the amount of energy that is needed for a chemical reaction to occur?
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Explanation:

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