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A gas at \(27^{\circ} \mathrm{C}\) has a volume \(V\) and pressure \(p .\) On heating, its pressure is doubled and volume becomes three times. The resulting temperature of the gas will be (a) \(1800^{\circ} \mathrm{C}\) (b) \(162^{\circ} \mathrm{C}\) (c) \(1527^{\circ} \mathrm{C}\) (d) \(600^{\circ} \mathrm{C}\)

Short Answer

Expert verified
The resulting temperature is \(1527^{\circ} \mathrm{C}\). (c)

Step by step solution

01

Understand the Initial Conditions

The initial temperature is given as \(27^{\circ} \mathrm{C}\). To work with gas laws, we need to convert it to Kelvin. Thus, \(T_1 = 27 + 273 = 300 \, \mathrm{K}\). The initial volume is \(V\) and initial pressure is \(p\).
02

Apply Gas Law for Final Conditions

Upon heating, the pressure doubles and volume becomes three times. Hence, the new pressure \(p_2 = 2p\), and the new volume \(V_2 = 3V\). The relation using the Ideal Gas Law is \(\frac{p_1 V_1}{T_1} = \frac{p_2 V_2}{T_2}\). Substitute the known values: \(\frac{pV}{300} = \frac{2p \times 3V}{T_2}\)
03

Solve for the Final Temperature

Rearrange the equation from the previous step to find \(T_2\). \(T_2 = \frac{2p \times 3V \times 300}{pV}\). Simplify this to obtain \(T_2 = 1800 \, \mathrm{K}\).
04

Convert the Final Temperature Back to Celsius

Convert \(T_2\) back to Celsius by subtracting 273: \(T_2 = 1800 - 273 = 1527^{\circ} \mathrm{C}\).

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Temperature Conversion
Temperature conversion is crucial in scientific calculations, especially when dealing with gas laws. Different temperature scales like Celsius, Fahrenheit, and Kelvin serve various purposes. However, Kelvin is the preferred scale in scientific and engineering contexts because it is an absolute temperature scale. In the Ideal Gas Law, temperatures must be in Kelvin.To convert from Celsius to Kelvin, you add 273.15. For instance, an initial temperature of \(27^{\circ} \mathrm{C}\) is converted to Kelvin as follows:
  • Add 273.15 to Celsius: \(27 + 273.15 = 300.15\,\mathrm{K}\).
Though in many problems, we approximate 273.15 as 273 for simplicity. Thus, we get \(T_1 = 300 \, \mathrm{K}\). Remember, using the correct temperature scale is vital for accurate results.
Gas Laws
Gas laws describe the behavior of gases in different conditions of temperature, pressure, and volume. The Ideal Gas Law is a fundamental equation that combines various gas laws into one. It is expressed as \(PV = nRT\). Here, \(P\) is pressure, \(V\) is volume, \(n\) is the number of moles, \(R\) is the gas constant, and \(T\) is temperature in Kelvin.The Ideal Gas Law helps us understand how a gas will behave when subjected to changes in pressure, volume, or temperature. In the given problem, as pressure doubles and volume triples, the equation alters as follows:
  • Initial state: \(PV = nRT_1\)
  • Final state: \(2P \times 3V = nRT_2\)
Using these relations allows us to solve for unknowns like final temperature.
Temperature-Pressure-Volume Relationship
The temperature-pressure-volume relationship is a fascinating interplay described by the Ideal Gas Law. When you tweak one variable, it influences the others, provided the quantity of gas remains constant.In the exercise, we observe:
  • Initial conditions: pressure \(p\), volume \(V\), and temperature \(T_1 = 300\, \mathrm{K}\).
  • Final conditions: pressure doubled \(2p\), volume tripled \(3V\), temperature \(T_2\) unknown initially.
The mathematical representation using the Ideal Gas Law is \(\frac{p_1V_1}{T_1} = \frac{p_2V_2}{T_2}\).Upon heating, solving the equation simplifies to finding \(T_2 = 1800 \, \mathrm{K}\). This illustrates the direct relationship—by understanding how pressure and volume change, you can deduce the new temperature.

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Most popular questions from this chapter

A Carnot engine is made to work between \(200^{\circ} \mathrm{C}\) and \(0^{\circ} \mathrm{C}\) first and then between \(0^{\circ} \mathrm{C}\) to \(-200^{\circ} \mathrm{C}\). The ratio of efficiencies of the engine in the two cases is (a) \(1: 2\) (b) \(1: 1\) (c) \(1.73: 1\) (d) \(1: 1.73\)

A Carnot engine whose source is at \(400 \mathrm{~K}\) takes \(200 \mathrm{cal}\) of heat and rejects \(150 \mathrm{cal}\) to the sink. What is the temperature of the sink? (a) \(800 \mathrm{~K}\) (b) \(400 \mathrm{~K}\) (c) \(300 \mathrm{~K}\) (d) Cannot say

For a gas, the difference between the two principal specific heats is \(4150 \mathrm{Jkg}^{-1} \mathrm{~K}^{-1}\). What is the specific heat of the gas at constant volume if, the ratio of specific heat is \(1.4 ?\) (a) \(5186 \mathrm{Jkg}^{-1} \mathrm{~K}^{-1}\) (b) \(10375 \mathrm{Jkg}^{-1} \mathrm{~K}^{-1}\) (c) \(1660 \mathrm{Jkg}^{-1} \mathrm{~K}^{-1}\) (d) \(8475 \mathrm{Jkg}^{-1} \mathrm{~K}^{-1}\)

A perfect gas goes from state \(A\) to state \(B\) by absorbing \(8 \times 10^{5} \mathrm{~J}\) of heat and doing \(6.5 \times 10^{5} \mathrm{~J}\) of external work. It is now transferred between the same two states in another process in which it absorbs \(10^{5} \mathrm{~J}\) of heat. In the second process, (a) work done on gas is \(10^{5} \mathrm{~J}\) (b) work done on gas is \(-0.5 \times 10^{5} \mathrm{~J}\) (c) work done by gas is \(10^{5} \mathrm{~J}\) (d) work done by gas is \(0.5 \times 10^{5} \mathrm{~J}\)

In a thermodynamic process pressure of a fixed mass of a gas is changed in such a manner that the gas molecules gives out \(20 \mathrm{~J}\) of heat and \(10 \mathrm{~J}\) of work is done on the gas. If the internal energy of gas \(40 \mathrm{~J}\) then the final internal energy will be (a) \(30 \mathrm{~J}\) (b) \(20 \mathrm{~J}\) (c) \(60 \mathrm{~J}\) (d) \(40 \mathrm{~J}\)

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