An airplane is pressurized with air to 700 mmHg . If air is 21% oxygen, what is the partial pressure of oxygen on the plane?
Express your answer using two significant figures

What is the percent by mass of oxygen in fe2o3

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Select the correct answer from each drop-down menu. to make a table of the elements, dmitri mendeleev sorted the elements according to their . he then split the list of elements into several columns so that elements beside each other had similar .