During a recent winter month in sheboygan, wisconsin, it was neccessary to obtain 3500 kwh of heat providd by a natural gas furnace with 98 % efficiency to keep a small house warm (the effiiency of a gas furnace is the percent of the heat produced by combution that is transferred into the house).
(b) how many gallons of lpg (liquefied petroleum gas) would be required to replace the natural gas used? assume the lpg is liquid propane [c3h8 : dnsity, 0.5318 g/ml; enthalpy of combustion, 2219 kj. mol for te formation of co2 and h2o and the furnace used to burn the lpg has the sam efficiency as the gas furnace .