JEE Mains · Chemistry · STD 11 - 5. Thermodynamics and thermochemistry
The heats of combustion of carbon and carbon monoxide are \(-393.5\) and \(-283.5\, kJ\, mol^{-1},\) respectively. The heat offormation (in \(kJ\)) of carbon monoxide per mole is :
- A \(-676.5\)
- B \(-110\)
- C \(110.5\)
- D \(676.5\)
Answer & Solution
Correct Answer
(B) \(-110\)
Step-by-step Solution
Detailed explanation
Many enthalpy changes are difficult to measure directly under standard conditions. Hess law states that the total enthalpy change of a reaction is independent of the route taken. To find \(H _{ f }, C _{( s )}+\frac{1}{2} O _{2}( g ) \rightarrow CO ( g )\) Given:- combustion of…
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Chemistry
- Correct statements from the following are:
A. Nitrogen in oxidation states from \(+1\) to \(+4\) disproportionates in acid medium.
B. Nitrogen has the ability to form \(d\pi - p\pi\) multiple bonds with itself and other elements with small size and high electronegativity.
C. N-N single bond is stronger than P-P single bond.
D. Nitrogen has highest density in its group due to small size.
E. The maximum covalency of nitrogen is four since it has only four valence orbitals for bonding.
Choose the correct answer from the options given below:JEE Mains 2026 Medium - If \(AB _{4}\) molecule is a polar molecule, a possible geometry of \(AB _{4}\) is :JEE Mains 2020 Medium
- The de-Broglie's wavelength of an electron in the \(4^{\text {th }}\) orbit is _______. \(\pi a_0 .\left(a_0=\right.\) Bohr's radius)JEE Mains 2024 Medium
- At temperature T, compound \(\mathrm{AB}_{2(\mathrm{~g})}\) dissociates as \(\mathrm{AB}_{2(\mathrm{~g})} \rightleftharpoons \mathrm{AB}_{(\mathrm{g})}+\frac{1}{2} \mathrm{~B}_{2(\mathrm{~g})}\) having degree of dissociation \(x\) (small compared to unity). The correct expression for \(x\) in terms of \(\mathrm{K}_{\mathrm{p}}\) and p is _______.JEE Mains 2025 Medium
- Match List - I with List - II.
List - I
(Transition metal ion)List - II
(Spin only magnetic moment (B.M.))(A) Ti3+ (I) 3.87 (B) V2+ (II) 0.00 (C) Ni2+ (III) 1.73 (D) Sc3+ (IV) 2.84
Choose the correct answer from the options given below :JEE Mains 2025 Medium - The species in which the \(N\) atom is in a state of \(sp\) hybridization is :JEE Mains 2016 Medium
More PYQs from JEE Mains
- The equation which is balanced and represents the correct product(s) is :JEE Mains 2014 Hard
- At the centre of a half ring of radius \(R=10 \mathrm{~cm}\) and linear charge density \(4 \mathrm{n} \mathrm{C} \mathrm{m}^{-1}\), the potential is \(x \pi V\). The value of \(x\) is _______.JEE Mains 2024 Hard
- Consider a cylinder of mass \(M\) resting on a rough horizontal rug that is pulled out from under it with acceleration \('a'\) perpendicular to the axis of the cylinder. What is \(F_{friction}\) at point \(P\) ? It is assumed that the cylinder does not slip
JEE Mains 2014 Hard - Let P be the set of seven digit numbers with sum of their digits equal to 11 . If the numbers in P are formed by using the digits 1,2 and 3 only, then the number of elements in the set \(P\) is :JEE Mains 2025 Medium
- Water droplets are coming from an open tap at particular rate. The spacing between a droplet observed at \(4^{{th}}\;second\) after its fall to the next droplet is \(34.3 \,{m}\). At what rate the droplets are coming from the tap ? (Take \(g=9.8\, {m} / {s}^{2}\))JEE Mains 2021 Hard
- If a circle \(C\) passing through \((4, 0)\) touches the circle \(x^2 + y^2 + 4x - 6y - 12 = 0\) externally at a point \((1, -1),\) then the radius of the circle \(C\) isJEE Mains 2013 Hard