Modern vacuum pumps can evacuate a vessel down to a pressure of 4.0 x 10^-15atm. at room temperature (300 K). Taking R = 8.3 KJ^-1 mole^-1, 1 atm = 10^5 Pa and NAvogradro = 6 x 10^23 mole^-1 , the mean distance between molecules of gas in an evacuated vessel will be of the order of a.0.2mu m b.0.2 mm c.0.2 cm d.0.2 nm
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Step-by-step explanation:
A polygon with 6 side is called hexagon.
and a regular hexagon have all angle of same degree
so let the one angle of hexagon be "x"
so sum of all 6 angle =6x
and sum of all angle of any hexagon= 720°
by this
6x= 720°
x=720°/6
x=120°
let exterior angle be y
and in figure you can see that the exterior angle and interior angle are liying on a same line
so
x+y=180°
120°+y=180°
y=180°-120°
y=60°
so all exterior angle of hexagon is 60°
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