Agas initially at stp is changed to 248 k. calculate the final pressure of the gas.

The final pressure of the gas at 248 K is 0.908 atm

Explanation:

              At standard temperature and pressure, temperature of 0 Celsius and pressure which is equal to the atmosphere, 1 atm.

= 0 Celsius

= 1 atm

Change in temperature causes a change in the pressure:  

                          =248K

                          =?

Calculating the pressure,   using the Gay-Lusaac's law:  

Convert the temperatures from Celsius to Kelvin:

                        =0 Celsius+273=273K

                        =248K

To find  :

  = = 0.908 atm

what is the average time it took the car to travel 0.25 meters?

⇒ 2.23 seconds

what is the average time it took the car to travel 0.50 meters?

⇒ 3.13 seconds

what is the question here. i think you messed up.