निम्न आंकड़ों के आधार पर `Delta_(f)H^(@)(N_(2)O_(5),g)` का मान kJ/mol में है
`{:(2NO(g)+O_(2)(g)to2NO_(2)(g),Delta_(r)H^(@)=-114" JK/mol"),(4NO_(2)(g)+O_(2)(g)to2N_(2)O_(5)(g)," "Delta_(r)H^(@)=-102.6" kJ/mol"),(Delta_(f)H^(@)(NO,g)=90.2" kJ/mol",):}`

Options

A. `15.1`
B. `30.2`
C. `-36.2`
D. इनमे से कोई नहीं

Answer

A

Explanation

`1/2N_(2)(g)+1/2O_(2)(g)toNO(g)" "Delta_(f)H^(@)=90.2`
`N_(2)(g)+O_(2)(g)to2NO(g)" "Delta_(r)H^(@)90.2xx2` . . . (1)
`2NO(g)+O_(2)(g)to2NO_(2)(g)" "Delta_(r)H^(@)=-114` . . . . (2)
`2NO_(2)(g)+1/2O_(2)(g)toN_(2)O_(5)(g)" "Delta_(r)H^(@)=(-102.6)/(2)=-51.3` . . .. (3)
समीकरण `(1)+(2)+(3)` से
`N_(2)(g)+(5)/(2)O_(2)(g)toN_(2)O_(5)(g)" "Delta_(f)H^(@)(N_(2)O_(5),g)=15.1" kJ/mol"`