At standard temperature and pressure, the number of gaseous molecules that the flask contains is equal to 1.2098 × 10^23.
According to the given data, the volume of the flask is equal to 4.50 L.
As the volume occupied by one mole of any gas at standard temperature and pressure is 22.4 liters, therefore the number of moles in the flask can be calculated as follows;
n = 4.5 ÷ 22.4
n = 0.2009
As one mole is equal to 6.02 × 10^23 units
The number of gaseous molecules in the flask can be calculated as follows;
0.2009 × ( 6.02 × 10^23 ) = 1.2098 × 10^23
Hence, the number of gaseous molecules in the flask is calculated to be 1.2098 × 10^23.
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