For the reaction 2H2(g)+2NO(g) arrow N2(g)+2H2O(g) the observed rate expression is, rate =kf [NO]2[H2]. The rate expression for the reverse reaction is :

Question

For the reaction 2H2(g)+2NO(g) arrow N2(g)+2H2O(g) the observed rate expression is, rate =kf [NO]2[H2]. The rate expression for the reverse reaction is : (A) kb[N2][H2O]2 (B) kb[N2][H2O] (C) kb[N2][H2O]2/[H2] (D) kb[N2][H2O]2/[NO]

Tardigrade Admin · Accepted Answer

Given reaction is, 2 H 2( g )+2 NO ( g ) arrow N 2( g )+2 H 2 O ( g ) r f = k f [ NO ]2[ H 2] Now, K eq =( k f / k b )=([ N 2] ×[ H 2 O ]2/[ H 2]2 ×[ NO ]2) Rearranging the above equation, k f [ NO ]2[ H 2] =k b ([ N 2][ H 2 O ]2/[ H 2]) ⇒ r f = r b ⇒ r b = k b ([ N 2][ H 2 O ]2/[ H 2])

Q. For the reaction
$2 H_{2} (g) + 2 NO (g) \to N_{2} (g) + 2 H_{2} O (g)$
the observed rate expression is, rate $= k_{f} [NO]^{2} [H_{2}]$ . The rate expression for the reverse reaction is :

$k_{b} [N_{2}] [H_{2} O]^{2}$

$k_{b} [N_{2}] [H_{2} O]$

$k_{b} [N_{2}] [H_{2} O]^{2} / [H_{2}]$

$k_{b} [N_{2}] [H_{2} O]^{2} / [NO]$

Q. For the reaction 2H2​(g)+2NO(g)→N2​(g)+2H2​O(g) the observed rate expression is, rate =kf​[NO]2[H2​]. The rate expression for the reverse reaction is :

kb​[N2​][H2​O]2

kb​[N2​][H2​O]

kb​[N2​][H2​O]2/[H2​]

kb​[N2​][H2​O]2/[NO]

Given reaction is, 2H2​(g)+2NO(g)→N2​(g)+2H2​O(g) rf​=kf​[NO]2[H2​] Now, Keq​=kb​kf​​=[H2​]2×[NO]2[N2​]×[H2​O]2​ Rearranging the above equation, kf​[NO]2[H2​] =kb​[H2​][N2​][H2​O]2​ ⇒rf​=rb​ ⇒rb​=kb​[H2​][N2​][H2​O]2​

Q. For the reaction
$2 H_{2} (g) + 2 NO (g) \to N_{2} (g) + 2 H_{2} O (g)$
the observed rate expression is, rate $= k_{f} [NO]^{2} [H_{2}]$ . The rate expression for the reverse reaction is :

$k_{b} [N_{2}] [H_{2} O]^{2}$

$k_{b} [N_{2}] [H_{2} O]$

$k_{b} [N_{2}] [H_{2} O]^{2} / [H_{2}]$

$k_{b} [N_{2}] [H_{2} O]^{2} / [NO]$