Answer
See the answer below.
Work Step by Step
From ideal gas law:
$PV=nRT$
$n=(8\ mmHg/760\ mmHg×101325\ Pa)×10\ m^3\div 8.314\ Pa.m^3/K.mol\div(27+273)\ K$
$n=4.28\ mol$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.