Respuesta :
Answer: 0.07 moles
Explanation:
According to Dalton's law, the total pressure of a mixture of gases is the sum of individual pressures exerted by the constituent gases.
Thus [tex]p_{total}=p_{H_2O}+p_{H_2}[/tex]
Given: [tex]p_{total}=725torr[/tex]
[tex]p_{H_2O}=24torr[/tex]
[tex]p_{H_2}=?[/tex]
Thus [tex]725torr=24torr+p_{H_2}[/tex]
[tex]p_{H_2}=701torr[/tex]
According to the ideal gas equation:'
[tex]PV=nRT[/tex]
P= Pressure of the gas = 701 torr = 0.92 atm   (760torr=1atm)
V= Volume of the gas = 1.85 L
T= Temperature of the gas = 308 K
R= Value of gas constant = 0.082 Latm\K mol
[tex]n=\frac{PV}{RT}=\frac{0.92\times 1.85L}{0.0821 \times 308}=0.07moles[/tex]
Thus 0.07 moles of hydrogen gas is contained in 1.85 L of this mixture at 308 K.
