7. A 26.4-ml sample of ethylene gas, C2H4, has a pres-sure of 2.50 atm at 2.5°C. If the
volume is increased to 36.2 mL and the temperature is raised to 10°C, what is the
new pressure. (Hint: Three variables have been given so what equation will you
use?)

1.87 atm

Explanation:

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

The combined gas equation is,

where,

= initial pressure of gas = 2.50 atm

= final pressure of gas = ?

= initial volume of gas = 26.4 ml

= final volume of gas = 36.2 ml

= initial temperature of gas =

= final temperature of gas =

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

The new pressure is 1.87 atm by using combined gas law.