If water with mass of 15.0 grams is heated into water vapor in a closed system such as a closed glass jar, what is the mass of the gas after the water completely evaporates?

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