PLEASE HELP ITS 7TH grade science

Describe in detail the melting point behavior of the 80: 20 benzoic acid-mandelic acid mixture

What three things determine the shape and size of a puddle when water is poured out onto a surface

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?