What is the answer to this question?

Your friend offers to show you an intrusive igneous rock. which of the following would you expect to see?

In which situation can a mixture always be called a solution

If i initially have a gas at a pressure of 12 atm, a volume of 23 liters, and a temperature of 200 k, and then i raise the pressure to 14 atm and increase the temperature to 300 k, what is the new volume of the gas?