Question

the volume of a mass of gas at 37°c and a pressure of 75 cm of Mercury is 620c.c find the volume at N.T.P.​

Answer 1

you mean, the volume of a mass of gas at 37°c and a pressure of 75 cm of Mercury is 620cc find the volume at N.T.P. right ?

solution : volume of gas , V = 620cc = 620ml = 0.62L

temperature , T = 37° = 310K

pressure , P = 75cm = 75/76 atm [as 1 atm = 76cm Hg]

using equation, PV = nRT

so, n = (0.62 × 75/76)/R(310).....(1)

at NTP ( normal temperature and pressure)

temperature , T' = 15° = 288.15K

pressure , P' = 1atm

applying equation, P'V' = nRT'

or, 1atm × V' = nR × (288.15K)

or, V' = nR(288.15)

from equation (1),

V' = (0.62 × 75/76 × 288.15)/(310)

= 0.568L

hence, volume of gas at NTP is 0.568L

Answer 2

Answer:

538.8cc

Explanation:

t1=37+273=310

p1v1/t1=p2v2/t2

75×620/310=76×v2/273

v2=75×2(273)/76

v2=538.8