Question

at
127°C temperature and 38 cm pressure a gas
attains
40 litres. Calculate its
volume at STP .​

Answer 1

Answer:

from ideal gas equation, PV = nRT

So, this gives V=

P

nRT

so, V is proportional to absolute temperature and inversely proportional to the pressure of the gas

Now temperature is made half and pressure is made 2 times

So, clearly the volume becomes one-fourth of it's original value.

So, B is the correct answer.

Answer 2

The volume at STP is 13.65 litres.

Given - Temperature, pressure and volume

Find - Volume at STP

Solution - As we know, pressure at STP is 76 cm Hg and Temperature is 273 K.

Using the relation to find volume -

P1V1/T1 = P2V2/T2

Here, P1 V1 T1 are initial pressure, volume and temperature and P2 V2 T2 are final pressure, volume and temperature.

T1 = 127 + 273

T1 = 400 K

Keep the values in formula

V2 = (38*40*273)/(400*76)

V2 = 414960/30400

V2 = 13.65 litres

Hence, the volume at STP is 13.65 litres.

#spj2