Determine property functions required

You have 10lbm of butane as a two-phase system at 75F in a 4ft3 rigid cell volume. What is the minimum amount of heat you need to add such that without adding/removing any mass from the container you have an all gas phase and what would be the final pressure and temperature? - By minimum we mean we have saturated vapor, that is at a new vapor pressure. Use NIST to determine property functions required ( U,H, molar or specific volumes, densities, etc.) Data: Use field units for the whole problem Data: Vt=mt=T=4ft310lbm75orF