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Measurement of Atmospheric Pressure

The unit torr...

Question

The unit torr is related to the barometric height as

(a) 1 torr = 1 cm of Hg

(b) 1 torr = 0.76 m of Hg
(c) 1 torr = 1 mm of Hg

(d) 1 torr = 1 m of Hg

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Solution

(c) 1 torr = 1 mm of Hg

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The unit torr is related to barometric height as

Q. The unit torr is related to the barometric height as

Q. For the reaction,

2 N O + H_{2} \to N_{2} O + H_{2} O

the value of -dp/dt is found to be

1.50 T o r r s^{- 1}

for a pressure of 359 Torr of

N O

0.25 T o r r s^{- 1}

for a pressure of 152 Torr, the pressure of

H_{2}

being constant. On the other hand, when the pressure of

N O

is kept constant, \dp/dt is

1.60 T o r r s^{- 1}

for a hydrogen pressure of 289 Torr and

0.79 T o r r s^{- 1}

for a pressure of 147 Torr. The over all order of the reaction is :

The pressure exerted by exactly 1 mm of mercury column at $0^{\circ}$ and at standard gravity is termed as

1 T O R R

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