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# Answer to Question #146711 in Chemical Engineering for Sagar

Question #146711
The gross heating value (GHV) of gaseous propane at 298 K is 2219.71 kJ/mol. Calculate the net heating value (NHV) of the propane. Given that, the latent heat of water vapours at 298 K=2442.5 kJ/kg.
1
2020-12-09T04:59:04-0500

Basis : 1 mol of gaseous propane.

"C_3H_8+5O_2\\to 3CO_2 +4H_2O"

"1 mol\\space C_3H_8 =4\\space mole H_2O"

"i.e\\space when \\space 1mol \\space of \\space C_3H_8 \\space burnt , 4\\space moles \\space of \\space H_2O \\space are \\space produced."

Water produced = 4*18 = 72 g = "72 *10^{-3} g"

"NHV = Net \\space heating \\space value= GHV- Latent \\space heat \\space of water \\space vapor"

"\\space\\space\\space\\space\\space\\space\\space\\space\\space\\space\\space=2219.71-72*10^{-3}*2442.5"

"\\space\\space\\space\\space\\space\\space\\space\\space\\space\\space\\space=2043.85\\space kJ\/mol"

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