Methane gas is expanded from an initial volume of 20.5 l at 0.92 atm at 23oc to a final volume of 34.6 l. during the expansion the gas cools to 12.0oc. what is the final pressure?

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.