P4 + 6 H2 --> 4 PH3 If you have 4.5 moles of H2, how many moles of PH3 can you make?​

A1.50-liter sample of dry air in a cylinder exerts a pressure of 3.00 atmospheres at a temperature of 25°c. without changing the temperature, a piston is moved in the cylinder until the pressure in the cylinder is reduced to 1.00 atmospheres. the volume of the gas is