Answer : The number of moles of argon gas is, 11.5 mol
Explanation :
To calculate the moles of argon we are using ideal gas equation as:
[tex]PV=nRT[/tex]
where,
P = pressure of argon gas = 658 mmHg = 0.866 atm (1 atm = 760 mmHg)
V = volume of argon gas = 30.6 L
n = number of moles of argon gas = ?
R = gas constant = 0.0821 L.atm/mol.K
T = temperature of argon gas = 28 K
Now put all the given values in the above formula, we get:
[tex](0.866atm)\times (30.6L)=n\times (0.0821 L.atm/mol.K)\times (28K)[/tex]
[tex]n=11.5mol[/tex]
Therefore, the number of moles of argon gas is, 11.5 mol
