English
Hindi

Question

Download Solution PDF

In the thermodynamic relation pV = nRT, the term ‘n’ is

This question was previously asked in
HPCL Engineer Mechanical 12 Aug 2021 Official Paper (Shift 2)
Download PDF Attempt in App
View all HPCL Engineer Papers >
  1. a gas constant
  2. Avogadro number
  3. universal gas constant
  4.  number of moles

Answer (Detailed Solution Below)

Option 4 :  number of moles
Free Tests
View all Free tests >
Free
Environmental Engineering for All AE/JE Civil Exams Mock Test
20 Qs. 20 Marks 20 Mins
Start Now

Detailed Solution

Download Solution PDF

Concept:

A hypothetical gas that obeys the law PV = nR̅T at all pressures and temperatures is called Ideal gas. 

There are two equations for Ideal Gas.

  1. PV = nR̅T
  2. PV = mRT, P = ρRT

where,

P = Absolute pressure (Pa), V = Volume (m3), n = Number of moles of the gas , Universal gas constant (8314 J/kg-mol.K), , T = Absolute Temperature (K), M = Molecular weight of the gas, m = Mass of gas (kg) & ρ = Density of gas (kg/m3).

Download Solution PDF
Latest HPCL Engineer Updates

Last updated on Jun 2, 2025

-> HPCL Engineer 2025 notification has been released on June 1, 2025.

-> A total of 175 vacancies have been announced for the HPCL Engineer post in Civil, Electrical, Mechanical, Chemical engineering.

-> HPCL Engineer Online application will be activated from 1st June 2025 to 30th June 2025.

-> Candidates with a full-time engineering discipline in the relevant stream are eligible to apply.

-> The selection will be based on a Computer Based Test Group Task and/or Interview. Prepare for the exam using HPCL Engineer Previous Year Papers.

Exams Tests Super Practice

More The Equation of State for a Perfect Gas Questions

Q1.General gas equation is 
Q2.For perfect gas, the equation of state is              
Q3.The term R in ideal gas equation PV = RT is known as which of the following?
Q4.General Gas Equation is -
Q5.In the thermodynamic relation pV = nRT, the term ‘n’ is
Q6.A gas weighs 16 N/m3 at 288 K and at an adiabatic pressure of 25 N/cm2. Its gas constant is
Q7.A cylinder of 50-litre capacity contains oxygen at temperature of 27°C and at absolute pressure 10 MPa. What will be the density of oxygen? [Gas constant for oxygen is 0.26 kJ/kg-K]
Q8.A portable compressor is taken from the place where the barometric pressure is 750 mm Hg and the average intake temperature is 27°C to a mountainous region where the barometric pressure is 560 mm Hg and temperature is 7°C. The reduction in mass output of the machine is:
Q9.If one mole of H2 gas occupies a rigid container with a capacity of 1000 litres and the temperature is raised from 27°C to 37°C, the change in pressure of the contained gas (round off to two decimal places), assuming ideal gas behavior, is ________ Pa. (R = 8.314 J/mol·K)

More Ideal and Real Gases Questions

Q1.When a gas or vapour is allowed to escape through a minute aperture such as leakage of steam through the safety valve of a pressure cooker, the leakage process is called
Q2.At absolute zero temperature (T = 0K), the specific enthalpy of an ideal gas is: 
Q3.Heat addition during the constant pressure process is equal to ________
Q4.Which of the following statements is correct for compressibility?
Q5.Find the enthalpy of 1 kg of dry and saturated steam at 10 bar if sensible heat at 10 bar is 762.8 kJ/kg and latent heat of evaporation at 10 bar is 2015.3 kJ/kg.
Q6.The enthalpy of water is considered as ‘zero’ at _______.
Q7.When any gas is heated at constant pressure, its change in volume varies directly with change in absolute temperature. This law is known as ________.
Q8.General gas equation is 
Q9.For perfect gas, the equation of state is              
Q10.The specific volume of air is: 
Suggested Test Series
View All >
Vocabulary Master for All Government Exams Mock Test
309 Total Tests with 1 Free Tests
Start Free Test
HPCL Engineer Mock Test 2025
80 Total Tests with   3 Free Tests
Start Free Test

HPCL Engineer Important Links

Eligibility CriteriaSalary and Job ProfileAdmit CardSyllabus and Exam PatternAnswer KeyCut Off

More Thermodynamics Questions

Q1.The Zeroth Law of Thermodynamics establishes the basis for which of the following?
Q2.For a closed system undergoing a thermodynamic cycle, the first law states which of the following?
Q3.Despite having the highest possible efficiency for Carnot cycle, it is not suitable for a practical engine using a gaseous working fluid as:
Q4.For an ideal gas
Q5.The reversible expansion of an ideal gas under adiabatic and isothermal conditions is shown in the figure. List I List II i) \(T_{1}=T_{2}\)  a) True ii) \(T_{3}>T_1\)  b) False iii) W\(_{isothermal}>W_{adiabatic}\)   iv) \(\Delta U_{isothermal}>\Delta U_{adiabatic}\)    
Q6.A system comprising of 2 kg of fluid undergoes a reversible process at 500 K during which it receives 1 MJ of heat. The change in specific entropy of system for this case and for the other case where heat supply had been doubled for the same initial and final states are
Q7.When a gas or vapour is allowed to escape through a minute aperture such as leakage of steam through the safety valve of a pressure cooker, the leakage process is called
Q8.A certain amount of gas of volume V at 27°C temperature and pressure 2 × 107 Nm–2 expands isothermally until its volume gets doubled. Later it expands adiabatically until its volume gets redoubled. The final pressure of the gas will be (Use, γ = 1.5)
Q9.Which of the following assertions holds true when a constant volume of gas is heated? 
Q10.The enthalpy of an open system _________. 
Testbook Edu Solutions Pvt. Ltd.
1st & 2nd Floor, Zion Building,
Plot No. 273, Sector 10, Kharghar,
Navi Mumbai - 410210
support@testbook.com
Toll Free:1800 833 0800
Office Hours: 10 AM to 7 PM (all 7 days)
Company
About usCareers We are hiringTeach Online on TestbookPartnersMediaSitemap
Products
Test SeriesTestbook PassOnline CoursesOnline VideosPracticeBlogRefer & EarnBooks
Copyright © 2014-2022 Testbook Edu Solutions Pvt. Ltd.: All rights reserved
User PolicyTermsPrivacy
Hot Links： teen patti gold download apk lucky teen patti teen patti club teen patti master real cash teen patti win