Advertisements
Advertisements
Question
Give the sign convention for Q and W.
Advertisements
Solution
- System gains heat - Q is positive
- System loses heat - Q is negative
- Work done on the system - W is positive
- Work done by the system - W is negative
APPEARS IN
RELATED QUESTIONS
The work done in vacuum when 300 m mole of an ideal gas expands until its volume is increased by 2.3 dm3 at 1 bar pressure is ______ mole.
Define the internal energy of the system.
Are internal energy and heat energy the same? Explain.
Give the expression for work done by the gas.
Explain Joule’s Experiment of the mechanical equivalent of heat.
Derive the expression for the work done in a volume change in a thermodynamic system.
When a system absorbs 8 kJ of heat and does 2.2 kJ of work on surrounding, calculate the internal energy change.
An ideal gas expands against a constant external pressure of 2.0 atmosphere from 20 litre to 40 litre and absorbs 10 kJ of heat from the surrounding. What is the change in the internal energy of the system?
(Given: 1 atm-litre = 101.3 J)
A gas is allowed to expand in a well insulated container against a constant external pressure of 2.5 Bar from an initial volume of 2.5L to a final volume of 4.5L The change in internal energy, ΔU of the gas will be ______.
The value of Δ U is ______ when 2 kJ of heat is released and 6 kJ of work is done on the system.
