Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

ICSE Class 9 Answered

A student forgets to add the reaction mixture to a flask at 27C. However he placed the flask on the flame. After a lapse of time he recorded the temperature of the flask with the help of a pyrometer and it was found to be 477C. What fraction of air would have been expelled out?
Asked by neelam827001 | 26 Jul, 2014, 11:35: AM
answered-by-expert Expert Answer
Method – 1 :
According to Ideal gas equation  PV = nRT
If initial no. of moles of gas in V lit container = 1
 
 
Method – 2 :
Suppose volume of vessel = V cm3
i.e. volume of air in the flask at 27 °C = V cm3
According to Charle’s law,

∴ Since volume gas is equal to volume of container and during heating volume of
container will not increase.
 
 
Answered by Hanisha Vyas | 30 Jul, 2014, 12:50: PM

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
ICSE 9 - Chemistry
A container containing hydrogen gas is heated such that its volume increases by 40% and  pressure decreases to 80% of its original value. If the original temperature was – 130C,  calculate the temperature to which the gas was heated.
Asked by zainaali39692 | 04 Dec, 2020, 08:53: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 9 - Chemistry
A gas occupies a volume of 340 CC at STP find its volume at 20 degrees celsius and 700 mm of HG
Asked by gup.navya2006 | 01 Dec, 2020, 09:28: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 9 - Chemistry
100cm3 of a gas at 27°c is cooled to 20°c at constant pressure .calculate volume of a gas at 20°c
Asked by Vishusingh2020.2021 | 25 Sep, 2020, 10:09: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 9 - Chemistry
A vessel of capacity 600 cm cube contains hydrogen gas at a pressure of 304 cm what will be the pressure of hydrogen gas when the vessel is connected to another vessel of 300 cm cube capacity
Asked by sudesghnapattanayak2017 | 19 May, 2020, 08:13: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 9 - Chemistry
It is found, on heating a gas, its volume increases by 50% and pressure decreases to 60% of its original value. If the original temperature was -15 degree celcius, find the temperature to which it was heated in celcius
Asked by abeshchakraborty6 | 23 Feb, 2020, 08:54: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 9 - Chemistry
At constant temperature, a gas is at a pressure of 1080 mm Hg. If the volume is decreased by 40%, find the new pressure of gas
Asked by dnlwalkers | 08 Jan, 2020, 09:57: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 9 - Chemistry
a gas occupies 200 cm3 at 27 degree celsius. what is its volume at 51 degree celsius , the pressure being kept constant?
Asked by raichuratanvi | 14 Dec, 2019, 12:02: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 9 - Chemistry
Ammonia gas occupies volume of 450ml at a pressure of 720mm of HG what volume will it occupies at standard pressure at the same temperature
Asked by merajanjum87 | 21 Nov, 2019, 09:53: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 9 - Chemistry
A gas x occupies a volume of 200ml at a pressure of 4 atmospheres. If the temperature remains constant what volume will it occupy at 1atmospheric pressure
Asked by parvathimanjunath24 | 31 Oct, 2019, 09:34: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
ICSE 9 - Chemistry
I didn’t understood v vs 1/p graph
Asked by devbhaisha.tl | 21 Sep, 2019, 10:02: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×