Question

Liqufied gas ( LNG) is primarily compsed of methane in liquid form. Answer the questions below using the proerties given. Liquid methane density=0.40 Kg/cm^3 (0.40 Kg/liter), Heat capacity = 3.50J/gram.C, molar mass = 16g/mol

c) if the liquid methane temperature is rasied from -80C to 30C, what rate of heating is needed for the 20grames/s flow?                 ( _____ value       _____unites)

Answer 1

Answer – We are given the, density=0.40 Kg/cm^3 (0.40 Kg/liter), Heat capacity = 3.50J/gram.C, molar mass = 16g/mol

Initial temp, ti = -80^oC , final temp. tf = 30^oC

Rate = 20grames/s flow

We know the formula

Heat, q = m * C*∆t

            = 20 g/s * 3.50J/g.^oC * (30 –(-80))^oC

             = 7700 J/s

              = 7.70 kJ/s

So the rate of heating is needed for the 20grames/s flow is 7.70 kJ/s.