Please i need the answer for 18,19,20

Answer and I will give you brainiliest

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?

What is the molar mass of ca(cio4)2

650.j is the same amount of energy as? 2720cal1550cal650.cal2.72cal