Q. 135.0( 1 Vote )
A sample of 0.177
STP means standard temperature-273.15K and pressure 101.325 kPa.
We know that rms speed of gas is given by
Where R=gas constant 8.31J/molK
T=temperature of gas
M=molar mass of gas
Mass =0.177g =0.17710-3kg
Volume = 1000cm3
We know that ideal gas equation is
Where V= volume of gas
N=number of moles of gas
So, we can write .
Putting the value of RT in vrms we get
nM= total mass of gas ‘m’
and density =
Putting the value of density and m in vrms, we get
Putting the value of P and in above equation we get
The rms speed of the gas molecules at STP is 1310.4ms-1.
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