Part B Constants 1 Perodc Table Liquid butane (CaH1e) and liquid propane (CHs) a

Question

Part B Constants 1 Perodc Table Liquid butane (CaH1e) and liquid propane (CHs) are often mored in cylinders, to be used as fueis. The normal bolling point ofbutane is-05-Cand its 1.823 1k//mol. The corresponding values for propane are-42.1 "Cand 15.4 k.J/mol, respectively How much energy is required to vaportze 145 g of butane at its boiling point? The heat of vaporization for butane is 23.1 k.J/mol Express your answer to three significant figures and include the appropriate units View Available Hints Value Units Part C What volume will 145 of butane occupy at 745 toer and 35 C Express your answer to three significent figures and include the appropriate units ew Avalable Hints Value Units

Explanation / Answer

molar mass of butane (C4H10)= 4*12+10= 58 g/mole

moles of butane in 145 gm = mass of butane/molar mass =145/58 =2.5 moles

latetnt heat= 23.1 KJ/mole, energy required to vaporize butane at its boiling point= moles of butane* latent heat= 2.5*23.1 = 57.75 Kj

2. at 35 deg.c, butane is vapor. Hence ideal gas law can be used to calculate volume (V)

V= n ( no of moles of butane)R ( gas constant =0.0821 L.atm/mole.K)T ( temperature in K)/P ( in atm)=

given n= 2.5 moles, P= 745 Torr, 760 torr= 1 atm, P= 745/760 atm =0.98 atm, T= 35 deg.c= 35+273= 308K

V= 2.5*0.0821*308/0.98 L=64.5 L

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