NEET Class neet Answered

Q no 106

Asked by manasvijha | 08 Apr, 2019, 09:56: PM

Expert Answer

Option (3) is correct.

Given:

Heat of formation of:

CH₄ = - 75 kJ/mol

CO₂ = -400 kJ/mol

H₂O = -240 kJ/mol

The combustion of metahne;

CH₄ + 2O₂ → CO₂ + 2H₂O

We know that,

Heat of combustion is;

increment subscript straight r space straight H space equals space begin inline style sum from blank to blank of end style space increment subscript straight f space straight H to the power of 0 subscript open parentheses Products close parentheses end subscript space minus space begin inline style sum from blank to blank of end style begin inline style space end style begin inline style increment subscript straight f end style begin inline style space end style begin inline style straight H to the power of 0 end style begin inline style blank subscript open parentheses Reactants close parentheses end subscript end style begin inline style space end style begin inline style space end style begin inline style space end style begin inline style space end style begin inline style space end style begin inline style space end style begin inline style space end style begin inline style space end style begin inline style space end style begin inline style space end style begin inline style space end style begin inline style space end style begin inline style space end style begin inline style space end style begin inline style space end style begin inline style space end style begin inline style space end style begin inline style space end style begin inline style space end style begin inline style space end style begin inline style space end style begin inline style space end style begin inline style space end style begin inline style space end style begin inline style space end style begin inline style space end style begin inline style space end style begin inline style space end style begin inline style space end style begin inline style space end style begin inline style space end style begin inline style space end style space begin inline style space space space end style begin inline style space end style begin inline style space end style begin inline style space end style begin inline style equals end style begin inline style open square brackets negative 400 space plus space open parentheses negative 240 cross times 2 close parentheses space close square brackets end style begin inline style minus end style begin inline style space end style begin inline style open square brackets negative 75 close square brackets end style begin inline style space end style begin inline style space end style begin inline style space end style begin inline style space end style begin inline style space end style space space space space space space begin inline style equals end style begin inline style space end style begin inline style minus end style begin inline style 400 end style begin inline style space end style begin inline style minus end style begin inline style space end style begin inline style 480 end style begin inline style space end style begin inline style plus end style begin inline style space end style begin inline style 75 end style begin inline style space equals space minus space 805 space kJ divided by mol end style space begin inline style space end style begin inline style As end style begin inline style space end style begin inline style heat end style begin inline style space end style begin inline style of end style begin inline style space end style begin inline style combustion end style begin inline style space end style begin inline style of end style begin inline style space end style begin inline style 1 end style begin inline style space end style begin inline style mole end style begin inline style space end style begin inline style of end style begin inline style space end style begin inline style methane end style begin inline style space end style begin inline style equals end style begin inline style space end style begin inline style 805 end style begin inline style space end style begin inline style kJ end style begin inline style divided by end style begin inline style mol end style begin inline style space end style begin inline style space end style begin inline style 0 end style begin inline style. end style begin inline style 4 end style begin inline style space end style begin inline style mole end style begin inline style space end style begin inline style of end style begin inline style space end style begin inline style methane end style begin inline style space end style begin inline style equals end style begin inline style space end style begin inline style 805 end style begin inline style cross times end style begin inline style 0 end style begin inline style. end style begin inline style 4 end style begin inline style space end style begin inline style space end style begin inline style space end style space begin inline style equals end style begin inline style 322 end style begin inline style space end style begin inline style space end style begin inline style kJ end style begin inline style divided by end style begin inline style mol end style begin inline style space end style space space space space space space space space begin inline style space end style

The amount of heat evolved by burning of 0.4 mol of methane is 322 kJ/mol.

Answered by Varsha | 09 Apr, 2019, 11:20: AM

Please Login or Sign up to continue!

NEET Class neet Answered

Choose Filters

Open In Ask A Doubt App ?

Get in Touch

Call / Whats App