Calculate the mass, in grams, of 2.74 L of CO gas measured at 33°C and 945 mmHg.
A)0.263 g
B)2.46 g
C)3.80 g
D)35.2 g
E)206 g

Question

Quizplus · Accepted Answer

First, we need to use the ideal gas law to find the number of moles of CO gas:
PV = nRT
n = PV/RT
n = (945 mmHg)(2.74 L)/(0.0821 L·atm/mol·K)(33°C + 273.15)
n = 0.136 mol
Next, we can use the molar mass of CO to convert moles to grams:
mass = n × molar mass
mass = 0.136 mol × 28.01 g/mol
mass = 3.80 g, which is closest to choice C (3.80 g).

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