Question

Define molar volume of a substance. What is the molar volume of an ideal gas at STP? What are the values of standard temperature and pressure in this case

Answer 1

+++++molar volume of an ideal gas at STP?

Pressure = 1 bar = 0.987 atm or 1 atm *

Temperature = 273 K or 0°C

For Ideal gas

Vmolar=273K∗0.08205Latm/(mol⋅K)1atm∗1molVmolar=273K∗0.08205Latm/(mol·K)1atm∗1mol

Vmolar=22.39L≈22.4L


The molar volume, symbol Vm, is the volume occupied by one mole of a substance (chemical element or chemical compound) at a given temperature and pressure. It is equal to the molar mass (M) divided by the mass density (ρ). It has the SI unit cubic metres per mole (m3/mol),although it is more practical to use the units cubic decimetres per mole (dm3/mol) for gases and cubic centimetres per mole (cm3/mol) for liquids and solids.



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Answer 2

Answer: Molar volume of an ideal gas at STP is 22.4 L.

Explanation:

Molar volume is the volume occupied by 1 mole of a gas at standard conditions of temperature and pressure (STP).

Using ideal gas equation:  

PV = nRT

$V=\frac{nRT}{P}$

At STP,

Temperature = 273 K

Pressure = 1 atm

n = no of moles = 1

R= gas constant =0.0821 Latm\molK

$V=\frac{1\times 0.0821\times 273K}{1atm}=22.4L$