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).
(e) what volumem of air is required to provide the oxygen for the combustion of the methane used to heat the house ? air contiais 23% oxygen by mass. the average density of air during the month was 1.22g/l.