If the heat of formation of NO 2 is ' x ' [1 / 2 N 2(g)+ O 2(g) arrow NO 2(g)] the heat of reaction N 2(g)+ O 2(g) arrow 2 NO (g) is y and the heat of reaction 2 NO (g)+ O 2(g) arrow 2 NO 2(g) is z, then

Question

If the heat of formation of NO 2 is ' x ' [1 / 2 N 2(g)+ O 2(g) arrow NO 2(g)] the heat of reaction N 2(g)+ O 2(g) arrow 2 NO (g) is y and the heat of reaction 2 NO (g)+ O 2(g) arrow 2 NO 2(g) is z, then (A) 2 x+z=y (B) 2 y+z=x (C) 2 x-z=y (D) 2 z+x=y

Tardigrade Admin · Accepted Answer

Given: 2 ×((1/2) N 2( g )+ O 2( g ) longrightarrow NO 2( g ) ; Δ H = x ) = N 2( g )+2 O 2 longrightarrow 2 NO 2( g ) ; Δ H 1=2 x Also, N 2+ O 2 longrightarrow 2 NO ( g ) ; Δ H = y 2 NO + O 2 longrightarrow 2 NO 2 ; Δ H = z Adding, we get N 2+2 O 2 longrightarrow 2 NO 2 ; Δ H 2= y + z ∵ Δ H 1=Δ H 2 (∵ H is state function) ⇒ 2 x = y + z

Q. If the heat of formation of $N O_{2}$ is ' $x$ '
$[1/2 N_{2 (g)} + O_{2 (g)} \to N O_{2 (g)}]$ the heat of reaction
$N_{2 (g)} + O_{2 (g)} \to 2 N O_{(g)}$ is $y$ and the heat of reaction
$2 N O_{(g)} + O_{2 (g)} \to 2 N O_{2 (g)}$ is $z$ , then

$2 x + z = y$

$2 y + z = x$

$2 x - z = y$

$2 z + x = y$

Q. If the heat of formation of NO2​ is ' x ' [1/2N2(g)​+O2(g)​→NO2(g)​] the heat of reaction N2(g)​+O2(g)​→2NO(g)​ is y and the heat of reaction 2NO(g)​+O2(g)​→2NO2(g)​ is z, then

2x+z=y

2y+z=x

2x−z=y

2z+x=y

Given: 2×(21​N2​(g)+O2​(g)⟶NO2​(g);ΔH=x) =N2​(g)+2O2​⟶2NO2​(g);ΔH1​=2x Also, N2​+O2​⟶2NO(g);ΔH=y 2NO+O2​⟶2NO2​;ΔH=z Adding, we get N2​+2O2​⟶2NO2​;ΔH2​=y+z ∵ΔH1​=ΔH2​(∵H is state function) ⇒2x=y+z

Q. If the heat of formation of $N O_{2}$ is ' $x$ '
$[1/2 N_{2 (g)} + O_{2 (g)} \to N O_{2 (g)}]$ the heat of reaction
$N_{2 (g)} + O_{2 (g)} \to 2 N O_{(g)}$ is $y$ and the heat of reaction
$2 N O_{(g)} + O_{2 (g)} \to 2 N O_{2 (g)}$ is $z$ , then

$2 x + z = y$

$2 y + z = x$

$2 x - z = y$

$2 z + x = y$