Answer
See the answer below.
Work Step by Step
Using the Ideal Gas Law, it follows:
$n=(0.00169/760×1\ atm)×1000\ L/((0.082)(301\ K))$
$n=0.00009\ mol$
Thus:
$0.00009\ mol×6.022×10^{23}=5.42×10^{19}\ atoms$
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