EASY
Chemistry
IMPORTANT
Earn 100

A heat engine absorbs heat Q1 at temperature T1 and heat Q2 at temperature T2. Work done by the engine is Q1+Q2 J. This data

25% studentsanswered this correctly

Important Questions on Thermodynamics

EASY
Chemistry
IMPORTANT
Consider the following reaction occurring in an automobile:
2C8H18 (g)+25O2 (g)16CO2 (g)+18H2O (g)
The sign of ΔH, ΔS and ΔG would be:
MEDIUM
Chemistry
IMPORTANT
Two moles of an ideal gas is expanded irreversibly and isothermally at 37C, until its volume is doubled and 3.41 kJ heat is absorbed from the surrounding. Stotal (system +surrounding ) is:
MEDIUM
Chemistry
IMPORTANT
For determining the spontaneity of a process, which of the following is considered?
MEDIUM
Chemistry
IMPORTANT
2 moles of an ideal gas at 27°C temperature is expanded reversibly from 2 L to 20 L. Find the entropy change incal K-1(R=2 cal/mol K)
EASY
Chemistry
IMPORTANT
Which of the following statements about the spontaneous reaction occurring in a galvanic cell is always true?
EASY
Chemistry
IMPORTANT

The efficiency of an hypothetical cell is about 84% which involves the following reaction:

As+B2+aqA2+aq+Bs; ΔH=-285 kJ

Then, the standard electrode potential of the cell will be (Assume as ΔS=0)

EASY
Chemistry
IMPORTANT
The auto-ionisation of water at 25° CH2O (l)H+ (aq)+OH- (aq), ionic product is 10-14. What is G° for the process?
EASY
Chemistry
IMPORTANT

For the reaction,

H2 g+12O2 gH2O l, ΔH=-285.8 kJ mol-1

ΔS=-0.163 kJ mol-1 K-1.

What is the value of free energy change, at 27 °C for the reaction?