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(a) State three Postulates of the Kinetic Theory of Gases
Answer –
(i) Gas molecules move randomly in a straight line colliding with one another and with the walls of the container
(ii) The collision between the gas molecules are perfectly elastic.
(iii) The actual volume occupied by the gas molecules is negligible compared with the volume of the container.
(b) Draw a sketch to illustrate Boyle’s law
Answer –
(c) The volume occupied by Carbon(IV)oxide at 760mmHg is 200cm3. Calculate the volume of the gas, if the pressure is changed to 253mmHg. Assuming the temperature of the system remains constant
Answer –
P1 = 760mmHg
V1 = 200cm3
P1 = 253mmHg
V2 = ?
P1V1 = P2V2
V2 = \( \frac{P_1V_1}{P_2} \\= \frac{760 \; \times \; 200}{253} \)
V2 = 600.79cm3
(a) Draw a pictorial representation of Boyle’s Law
Answer –
(b) The pressure of 100cm3 of Oxygen at 350C is 750mmHg. What will be the volume of the gas if the pressure is reduced to 100mmHg without changing the temperature\
Answer –
V1 = 100cm3 P1 = 750mmHg
V2 = ? P1 = 100mmHg
P1V1 = P2V2
V2 = \(\frac{P_1 V_1}{P_2}\\ = \frac{750 \; \times \; 100}{100} \\ = \scriptsize 750cm^3 \)
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