Answer :
The number of moles of helium gas present in a given volume at a specified temperature and pressure is 1.64 mol. The correct answer is b) 1.64 mol.
The ideal gas law is expressed as PV = nRT, where P represents pressure, V is volume, n is the number of moles, R is the ideal gas constant, and T is the temperature. To determine the number of moles, we can rearrange this equation
n = PV/RT
Plugging in the given values, we get:
n = (5.00 atm)(5.00 L)/((0.0821 L atm/mol K)(500 K))
Note that we had to convert the temperature from °C to K by adding 273 to get 500 K.
Solving for n, we get:
n = 1.64 mol
Therefore, the number of moles of helium that occupy a volume of 5.00 L at 227 °C and 5.00 atm is 1.64 mol.
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