Effect to pressure on - H is negligible if - n -

H = U+PV #916;H = #160; #916;U+ #916;(PV) #160; #160; #160; #160;= #160; #916;U + #160; #916;(nRT) #160; #160; #160; = #160 ...

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Byju's Answer

Standard XII

Chemistry

System, Surroundings, Intensive, Extensive Properties

Effect to pre...

Question

Effect to pressure on $Δ H$ is negligible if $Δ n =$ _____.

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Solution

H = U+PV

ΔH = ΔU+Δ(PV)

= ΔU + Δ(nRT)

= ΔU + RTΔn

If Δn =0,
ΔH = ΔU which is approximately constant if we change the operating pressure.

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Why the value of R is 2 calories here?

Question:

Heat of reaction for C6H12O6(s) + 6O2 → 6CO2(g) + 6H2O(v)at constant pressure is −651 K cal at 17∘ C. What is the heat of reaction at constant volume at 17∘ C?

Chemistry Chemical Thermodynamics Thermochemistry

Solution:

We know that Δ H = Δ U + Δ nRT

Given Δ H = −651 × 103cal; R = 2 calorie

T = 290K; Δ n = 6 + 6 − 6 = 6

∴ −651 × 103 = Δ U + 6 × 2 × 290

Δ U = −654.48 kcal

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Effect to pressure on ΔH is negligible if Δn=_____.

H = U+PVΔH = ΔU+Δ(PV) = ΔU + Δ(nRT) = ΔU + RTΔnIf Δn =0,ΔH = ΔU which is approximately constant if we change the operating pressure.

Effect to pressure on $Δ H$ is negligible if $Δ n =$ _____.

H = U+PV

ΔH = ΔU+Δ(PV)

= ΔU + Δ(nRT)

= ΔU + RTΔn

If Δn =0,
ΔH = ΔU which is approximately constant if we change the operating pressure.