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sameer ali Grade: 11
        

A glass tube of volume 112ml,containing a gas is partially evacuated till the pressure in it drops to 3.8*10-5 torr at 00C.the number of molecules of the gas remaining in the tube is?

8 years ago

Answers : (2)

Ramesh V
70 Points
										

volume = 0.112 L


pressure = 3.75 atm


temp = 273K


gas law is PV=nRT


n=3.75*0.112/(0.0821*273)


n=0.01874 moles


A mole has 6.0221415×1023 atoms or molecules of the pure substance being measured


no. of molecules = 112.87x1020


--


regards


Ramesh

8 years ago
Badiuddin askIITians.ismu Expert
147 Points
										

HI sameer ali


 


V=112 ml


P = 3.8*10-5 torr


T=00C=273 k


Use the formula PV=nRT


here n number of mole


and R is gas constant


and find the value of n


and we know that 1 mole of gas contain 1 avagadro number(A) of molecules


so n mole of contain n*A number of molecule at 00C


Take care of units during calculation





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Regards,
Askiitians Experts
Badiuddin




 

8 years ago
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