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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 0 0 C.the number of molecules of the gas remaining in the tube is?

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?

Grade:11

2 Answers

Ramesh V
70 Points
11 years ago

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

Badiuddin askIITians.ismu Expert
147 Points
11 years ago

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


 

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