How many moles of gas are in a gas sample occupying 0.816 L at 127 mmHg and 22°C?
A)178 mol
B)4.28 mol
C)57.4 mol
D)0.00563 mol
E)0.000462 mol

Question

Quizplus · Accepted Answer

To find the number of moles of gas, we can use the ideal gas law equation: PV = nRT, where P is the pressure in atmospheres, V is the volume in liters, n is the number of moles, R is the ideal gas constant (0.0821 L·atm/(mol·K)), and T is the temperature in Kelvin. First, convert the given pressure from mmHg to atm (127 mmHg * 1 atm/760 mmHg = 0.167 atm) and the temperature from Celsius to Kelvin (22°C + 273 = 295 K). Then, solve for n: n = PV/(RT) = (0.167 atm * 0.816 L) / (0.0821 L·atm/(mol·K) * 295 K) = 0.00563 mol.

How Many Moles of Gas Are in a Gas Sample