What is the pressure when the volume is raised to 8.21L?

How much heat is added if 0.814g of water increase in temperature by 0.351 degree c?

The solid xy decomposes into gaseous x and y: xy(s) m x(g) + y(g) kp = 4.1 (at 0 °c) if the reaction is carried out in a 22.4 l container, which initial amounts of x and y will result in the formation of solid xy?

What is the measured amount of a product obtained from a chemical reaction?