Thermodynamics And Thermochemistry, Popular Questions: Jee 1 year CHEMISTRY, Chemistry

Akanksha C. & 1 other asked a question

Subject: Chemistry, asked on on 19/11/16

bond dissociation enthalpy of CH4 is 360kJ/mol and C2H6 is 620kJ/mol. then bond dissociation energy of C-C bond is how much?

Siddharth Rathore asked a question

Subject: Chemistry, asked on on 10/12/16

In a container, two mole of a diatomic ideal gas is allowed to expand against 1 atm pressure and volume change from 2 L to 5 L. Calculate the change in Internal Energy.

Anshu Singh asked a question

Subject: Chemistry, asked on on 7/8/16

Why do iodine vapours have violet colour ?

Tanishka Gupta asked a question

Subject: Chemistry, asked on on 30/5/18

Q6. Consider the reaction at 300 K

H_{2} (g) + C l_{2} (g) \to 2 H C l (g) ∆ H ° = - 185 k J

If 3 moles of H₂ completely react with mole of Cl₂ to form HCl. What is

∆ U °

the for this reaction ?
(A) 0 (B) -185 kJ (C) 555 kJ (D) None of these

Manideep Varma asked a question

Subject: Chemistry, asked on on 28/12/16

find the maximum work obtained from the daniel cell if standard EMF of the daniel cell is 1.10 volt

Arvind asked a question

Subject: Chemistry, asked on on 8/4/17

One mole ideal gas expanded isothermally and reversibly to half of its initial pressure. delS is ?

Samiksha Jain asked a question

Subject: Chemistry, asked on on 9/11/16

A piston exerting a pressure of 1 atm rests on the surface of water at 100C . the pressure is reduced to smaller extent and as a result 9g of water evaporates and absorbs 20 kJ of heat. calculate
1.delta H
2. work done on water vapour
3. heat of vapourization
4. delta U

Tanishka Gupta asked a question

Subject: Chemistry, asked on on 31/5/18

Solve question 18

18. What is the work done

(|w|)

of 1 mole of monoatomic ideal gas in a process described by given V-T graph.

Use R = 2 cal/mol K, ln 2 = 0.7

(A) 500 cal
(B) 760 cal
(C) 660 cal
(D) 600 cal

Prithvi asked a question

Subject: Chemistry, asked on on 29/9/17

Hi mam,
This is Padma.
How to do this question?
when 110g of Mn dissolving in dil HNO3 at 27 C under atmospheric pressure, the work done is?

a)2494.2J
b)-2494.2J
c)-4988.4J
d)4988.4J

Snehal asked a question

Subject: Chemistry, asked on on 5/2/17

Explain the nature of zinc oxide with the help of reaction

Victor Ghosh asked a question

Subject: Chemistry, asked on on 22/9/17

At 25C, Delta G for the process H2O(l) W H2O(g) is 8.6 kJ/mol. Calculate the vapor pressure of water at this temperature.

Ishan asked a question

Subject: Chemistry, asked on on 25/11/18

iron metal can be produced by reducing Fe(III) oxide with hydrogen
Fe2O3(s) + 3H2 (g) ---- 2Fe(s) + 3H2O(g)
delta H =98.8 Kj and delta S =141.5 J/K
which is correct for above reaction
(1) spontaneous above 298 K (2) spontaneous below 298 K
(3) spontaneous below 698 K (4) spontaneous above 698 K

Nidhi Baghel asked a question

Subject: Chemistry, asked on on 31/10/17

In a gobar gas plant, gobar gas is obtained by bacterial fermentation of animal refuse. It is found to contain mainly Methane and its heat of combustion given by the equation: CH4(g) + 2O2(g) = CO2(g) + 2H2O(g) is 809 kJ/mole. How much gobar gas would have to be produced per day for a small village community of 100 families, if we assume that each family has to be supplied 20,000 kJ of energy per day to meet on its needs. The Methane content in gobar gas is 80% by weight.

Prakhar Pandey asked a question

Subject: Chemistry, asked on on 20/8/16

are graphical questions neceessary for iit???

Victor Ghosh asked a question

Subject: Chemistry, asked on on 26/9/17

Calculate heat of the following reaction at constant pressure, F2O(g) + H2O(g) ------> O2 (g) + 2HF(g)
The heats of formation of F2O (g), H2O(g) and HF (g) are 5.5 kcal, –57.8kcal and 64.2 kcal respectively.
(A) 76.1 Kcal
(B) 11.9 Kcal
(C) 71.6 Kcal
(D) 91.1 Kcal

Vishal asked a question

Subject: Chemistry, asked on on 24/9/19

calculate the lattice enthalpy of mgbr2 from the following data:
ΔH° sublimation of Mg(s) is 148 (kJ/mol)
ionization energy of is Mg 2187 (kJ/mol)
vaporization of Br2(l) is 31 (kJ/mol)
dissociation of Br2(g) is 193 (kJ/mol)
electron gain enthalpy of Br(g) is 331 (kJ/mol)
ΔH° for MgBr2(s) is 524(kJ/mol)

Hermoine asked a question

Subject: Chemistry, asked on on 8/10/17

Very Very Very urgent please help
One mole of napthalene was burnt in oxygen gas at constant volume to give CO2 gas and water at 25 C. The heat evolved was found to be 5138.8kJ.Calculate the heat of reaction at constant pressure.

Anshu Singh asked a question

Subject: Chemistry, asked on on 11/8/16

why is irreversible reaction not in equilibrium?

Samiksha Jain asked a question

Subject: Chemistry, asked on on 9/11/16

A mixture contains 8g He and 14 g N₂in a vessel at 300k. how much heat (in terms of R) is required to increase the rms speeds of these molecules to become the double their initial values? also calculate the final temperatures

Priyanka Priyanka asked a question

Subject: Chemistry, asked on on 12/8/17

Unit of entropy

Victor Ghosh asked a question

Subject: Chemistry, asked on on 26/9/17

Calculate heat of the following reaction at constant pressure, F2O(g) + H2O(g) ® O2 (g) + 2HF(g) The heats of formation of F2O (g), H2O(g) and HF (g) are 5.5 kcal, –57.8kcal and 64.2 kcal respectively.
(A) -76.5 Kcal
(B) -11.9 Kcal
(C) -71.6 Kcal
(D) -91.1 Kcal

Sudeshna Panigrahi asked a question

Subject: Chemistry, asked on on 11/9/16

Solve this.

Bhavya Arora asked a question

Subject: Chemistry, asked on on 26/9/17

In enthalpy of neutralisation,we used 1 gram equivalent of an acid and a base. Why not gram moles have been employed?

Shifa asked a question

Subject: Chemistry, asked on on 18/8/16

mjj

Rohit Sharma asked a question

Subject: Chemistry, asked on on 1/11/16

neither q nor w is a state function but q+w is a state function.why?

Hermoine asked a question

Subject: Chemistry, asked on on 8/10/17

what is the difference between heat of formation and enthaply of formation.While solving questions related to these Should the approach be different??

Tanishka Gupta asked a question

Subject: Chemistry, asked on on 6/7/18

Solve question 44

Ranjan Shivam asked a question

Subject: Chemistry, asked on on 11/8/17

what is the difference between phase and states of matter

Bhavya Arora asked a question

Subject: Chemistry, asked on on 26/9/17

Why heat energy and work energy are path function not state function?

Nevadhya asked a question

Subject: Chemistry, asked on on 31/1/17

Can you please explain me why when we talk about Hydration Enthalpy, energy is released, I mean why Hydration Enthalpy is the energy released, I think it should be the energy required?

Vishal asked a question

Subject: Chemistry, asked on on 24/9/19

calculate the change in enthalpy for the following reaction h2+br2---->2hbr given that bond enthalpy of h2 ,br2, hbr is 435kj/mol 192kj/mol and 368kj/mol respectively

Hermoine asked a question

Subject: Chemistry, asked on on 8/10/17

Please answer my questions ASAP tmrw is my test

Mohammad Arzaq Ansari asked a question

Subject: Chemistry, asked on on 20/10/17

chemistry part 1 class 11
pg no.183
q no 6.14
please can u solve this i am not getting how to do it

Hermoine asked a question

Subject: Chemistry, asked on on 8/10/17

Please answer my questions ASAP..

Vishal asked a question

Subject: Chemistry, asked on on 24/9/19

calculate the change in entropy for the following processes 2NOCl-->2NO+Cl2 if value of equilibrium constant for the reaction at 400k is 1.958*10^-4 and delta H is 77.2kj/mol

Sudeshna Panigrahi asked a question

Subject: Chemistry, asked on on 10/9/16

Question no. 3

Q. 3 Find the heat of formation of ethyl alcohol from following data :

C (s) + O_{2} (g) \to C O_{2} (g) . △ H = - 94 k c a l H_{2} (g) + \frac{1}{2} O_{2} (g) \to H_{2} O (l) . △ H = - 68 k c a l C_{2} H_{5} O H (l) + 3 O_{2} (g) \to 2 C O_{2} (g) + 3 H_{2} O (l) . △ H = - 327 k c a l

Priyanka Priyanka asked a question

Subject: Chemistry, asked on on 16/12/17

Why we take qv=∆U And qp=∆H

Ishan asked a question

Subject: Chemistry, asked on on 25/11/18

iam in a real hurry plz answer fast
consider the oxidation of iron metal at 25 degree celsius 4Fe (s) + 2O2 (g) ---- 2Fe2O3(s) and delta H =-1648.4 Kj
from the given data , under given conditions . delta S of Fe , O2, and Fe2O3 are 27.3 ,205, and 87.4 J/Kmolreaspectively, above reaction is
(1) spontaneous (2) non-spontaneous
(3) at equllibrium (4) cannot be predicted

Tanishka Gupta asked a question

Subject: Chemistry, asked on on 30/5/18

Solve question 7:

7. The difference between heat of reaction at constant volume and constant pressure of the reaction.

C_{2} H_{2} (g) + \frac{5}{2} O_{2} (g) \to 2 {CO}_{2} (g) + H_{2} O (l)

At 300 K in Kcal is [Given: R=2 cal/mol. K]
(A) -0.3 Kcal (B) +0.3 Kcal (C) -0.9 Kcal (D) None of these.

Vishal asked a question

Subject: Chemistry, asked on on 24/9/19

how is the third law of thermodynamics useful in the claculation of absolute entropies?? plz answer

Ishan asked a question

Subject: Chemistry, asked on on 24/10/18

determine solublityof

i) ferric hydroxide when Ksp= 1 * 10^-38
ii) lead chloride when Ksp= 1.6* *10^-5

Netra Saxena asked a question

Subject: Chemistry, asked on on 20/12/20

sir i didnt understand the part of expansion of reversible and irreveresible process,,