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Rina8888 [55]
3 years ago
5

In a car cylinder, a piston moves up and down inside a cylinder, causing the substance inside to expand and contract. Which type

of substance could be inside the cylinder?
Gas only

Liquid only

Liquid or solid only

Gas, liquid, or solid
Chemistry
1 answer:
GarryVolchara [31]3 years ago
4 0
A piston cylinder system usually makes use of a gas as the substance that is expanded and contracted. Internal combustion engines are used in cars to convert fuel into mechanical energy. The continuous up and down motion of the piston causes the crankshaft to rotate, which also does work to power the car. 
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Answer:

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Explanation:

Molar heat of solution is defined as the energy released (negative) or absorbed (Positive) per mole of solute being dissolved in solvent.

The dissolution of KBr is:

KBr → K⁺ + Br⁻

In the calorimeter, the temperature decreases 0.370K, that means the solution absorbes energy in this process. The energy is:

q = 1.36kJK⁻¹ × 0.370K

q = 0.5032kJ

Moles of KBr in 3.00g are:

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Thus, molar heat of solution of KBr is:

0.5032kJ / 0.0252moles = <em>20.0kJ/mol</em>

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