A Thomas flowmeter is a device in which heat is transferred at a measured rate from an electric coll to a flowing fluld, and the flow rate of the stream is calculated from the measured increase

of the fluid temperature. Suppose a device of this sort is inserted in a stream of nitrogen, the current through the heating coil is adjusted until the wattmeter reads $1\mathrm{.}25kW.$ and the stream temperature goes from $30C$ and $110$kPa before the heater to $34C$ and $110$kPa after the heater.

$($a$)$ If the specific enthalpy of nitrogen is given by the formula

$A\frac{k}{k}g$

what is the volumetric flow rate of the gas $($L$/$s$)$ upstream of the heater $($i$.$e$.,$ at $30C$ and $110$ kPa $?$ Assume that the gas has a molar mass of $28\mathrm{.}02\frac{g}{m}ol.$