Deduce the gas equation PV =nRT from gas law. Discuss the significance of gas constant R. Calculate its value in joules K ¹mol¹.
Answers
which is usually rearranged as
PV = nRT
This equation is called the ideal gas law. It relates the four independent properties of a gas at any time. The constant R is called the ideal gas law constant. Its value depends on the units used to express pressure and volume. Table 6.1 “Values of the Ideal Gas Law Constant R“ lists the numerical values of R.
Numerical Value Units
0.08205= L·atm/mol·K
62.36=L·torr/mol·K = L·mmHg/mol·K
8.314 =J/mol·K
The ideal gas law is used like any other gas law, with attention paid to the units and making sure that temperature is expressed in kelvins. However, the ideal gas law does not require a change in the conditions of a gas sample. The ideal gas law implies that if you know any three of the physical properties of a gas, you can calculate the fourth property.