A gas had a volume of 25.0 liters at 400.0 C and standard pressure. The gas was cooled until the volume was 12.5L at standard pressure. What was the final Celsius temperature of the gas?

Calculate the ph at the equivalence point for the titration of a solution containing 150.0 mg of ethylamine (c2h5nh2) with 0.1000 m hcl solution. the volume of the solution at the equivalence point is 250.0 ml. kb forethylamine is 4.7 × 10−4 .