The volume occupies by 1.58g of a gas at s.t.p is 500cm³. What is the relative molecular mass of the gas?

(G.M.V at s.t.p = 22.40dm³)

olyezema

4 years ago

At STP (standard temperature and pressure)
PV=nRT
P=1atm
V=500/1000=0.5dm³
R=0.082
T=273K
n=PV/RT
n=1×0.5/273×0.082
n=0.5/22.38=0.022moles
n=m/M
M=m/n
M=1.58/0.022=70.8~71g

solgade

1 year ago

funny that if you approximate to 0.02, you'll be confused when you finally get 79.

so the best advise is to stick with at least 4 numbers after decimal to be safe

Adedipeesther

1 year ago

mass=1.58kg,V =500cm^3
mole=v/molar .v
m=22.40dmx1000
=22400cm^3
mass/molar.m=volume/m.v
1.58kg/x=500/22400
cross multiply
x=22400x1.58/500
=71g

esongedaessiet

4 years ago

No be scam

umaisha

6 years ago

this is a scarm