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

11 years ago

Answers : (2)

Ramesh V
70 Points

volume = 0.112 L

pressure = 3.75 atm

temp = 273K

gas law is PV=nRT


n=0.01874 moles

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

no. of molecules = 112.87x1020




11 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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11 years ago
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