Question

calculate number of molecules present in 760 cc of a gas at 0℃ temperature and 700 mm of Hg- pressure.​

Answer 1

Formula,

PV=nRT

Given,

P=700mm=0.921atm

V=760cc=0.76L

R=0.0821LatmK−1mol−1

T=0∘C=273K

⇒n=RTPV

=0.0821×2730.921×0.76

∴n=0.0312moles

Number of moles,

=0.0312 moles×6.023×102