Question

How many moles of gas are there in a sample occupying 1.74 L at 0.136 atm and 25°C? 

Answer 1

PV = nRT

P = Pressure = 0.136atm

V= Volume =1.74 L

n = moles = ?

R= Gas Constant = 0.082057 L atm mol-1K-1

T = Temperature = 25 °C = 298 K

$(0.136×0.25) = n (0.82057×298)$

$n =\frac {(0.136×0.25)}{(0.82057×298)}$

$n = 0.00014mol$