What would be the final pressure of a system if a 175 ml sample of gas at 28°C and 98.9 kPa was cooled to 5°C and maintained a final volume of 125ml?

I need help with combined gas law (pressure volume temperature)
Please help I really dont understand this.

1 Answer
Apr 8, 2018

#P_2 approx 128 KPa#

Explanation:

Combined gas law:
#(P_1V_1)/T_1=(P_2V_2)/T_2#

You want to solve for #P_2#:
So: #P_2=(P_1V_1T_2)/(T_1V_2)#

Convert each given temperature to Kelvin:
#28°C+273= 301 K#
#5°C+ 273 K= 278K#

Plug in givens:
#P_2=((98.9 KPa)(175 ml)(278 K))/((301 K)(125 ml))#

#P_2 approx 128 KPa#