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

The correct answer is .

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;

Here, is the heat added to the system and is the heat rejected to the cold reservoir.

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

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

increased stability in the completion of fluorine's outer shell.

the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.