A sample of gas in a syringe has a volume of 66.0 mL and a pressure of 64.4 kPa. The plunger is depressed until the pressure reads 94.6 kPa What is the resulting volume? (T and n are constant)

The answer for #3 is c but i don't know why

If you have 5.25 grams of methane (ch4), how many grams of co2 will you produce ?

Which of the following observations indicates that there is a small, dense, positively charged part in the center of an atom? some uncharged particles are scattered by a gold foil. all uncharged particles are attracted towards a gold foil. all positively charged particles pass straight through a gold foil. some positively charged particles bounce back from a gold foil.