1. Tardigrade
  2. Question
  3. Chemistry
  4. Consider the following reaction: H2O(.ℓ .) arrow H2O(.g.);(ΔH)1=50kJ 2(CH)3OH(.ℓ .)+3O2(.g.) arrow 4H2O(.ℓ .)+2(CO)2(.g.);(ΔH)2=-1500kJ What is the value of ΔH for second reaction if water vapour instead of liquid water is formed as product ?

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. Consider the following reaction :
$H_{2}O\left(\right.\ell \left.\right) \rightarrow H_{2}O\left(\right.g\left.\right);\left(ΔH\right)_{1}=50kJ$
$2\left(CH\right)_{3}OH\left(\right.\ell \left.\right)+3O_{2}\left(\right.g\left.\right) \rightarrow 4H_{2}O\left(\right.\ell \left.\right)+2\left(CO\right)_{2}\left(\right.g\left.\right);\left(ΔH\right)_{2}=-1500kJ$
What is the value of $ΔH$ for second reaction if water vapour instead of liquid water is formed as product ?

NTA AbhyasNTA Abhyas 2020

Solution:

$2\left(CH\right)_{3}OH+3O_{2} \rightarrow 4H_{2}O\left(\right.g\left.\right)+2\left(CO\right)_{2}$
$ΔH=-1500+4\times 50$
$=-1500+200$
$=-1300kJ$