Answer
Please see the work below.
Work Step by Step
We know that
$P_{He}=6.91atm\times 0.790=5.46atm$
$P_{N_2}=6.91\times 0.170=1.17atm$
$P_{O_2}=6.91\times 0.040=0.28atm$
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.