Question

A 1.5L sample of a gas at 150kPa and 250K is changed to STP. What is the new volume?

Answer 1

Answer: The new volume is 2.4 L

Step-by-step explanation:

Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.

The combined gas equation is,

`(P_1V_1)/(T_1)=(P_2V_2)/(T_2)`

where,

`P_1` = initial pressure of gas = 150 kPa

`P_2` = final pressure of gas = 101 kPa (at STP)

`V_1` = initial volume of gas = 1.5 L

`V_2` = final volume of gas = ?

`T_1` = initial temperature of gas = 250 K

`T_2` = final temperature of gas = 273 K ( at STP)

Now put all the given values in the above equation, we get:

`(150* 1.5)/(250)=(101* V_2)/(273)`

`V_2=2.4L`

Thus the new volume is 2.4 L