Answer-
Given,
Volume = 7.90 L
Temperature = 19C or
292.15 K [0°C + 273.15 =
273.15K]
Partial Pressure of A = 0.200 atm
Partial Pressure of B = 0.692 atm
Moles of Third Gass C = 0.210 mol
Total Pressure = ?
We know that,
Ptotal = PA + PB + PC
where, PA , PB , PC are partial pressures
Also,
PV = nRT
where, P= Pressure in atm
V = Volume in L
n = Moles
R = Gas Constant (0.082057 L.atm.mol-1.K-1)
T = Temperature in K
So, partial Pressure of Third Gas ( PC ),
PC = ( 0.210 mol * 0.082057 L.atm.mol-1.K-1 * 292.15 K ) / 7.90 L
PC = 0.637 atm
So, Ptotal = PA + PB + PC
Ptotal = 0.200 atm + 0.692 atm + 0.637 atm
Ptotal = 1.53 atm [Answer]
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