At PO2 = 40 mm Hg, which statement about the saturation of either myoglobin (Mb) or hemoglobin (Hb) is true? At PO2 = 40 mm Hg,
which statement about the saturation of either myoglobin (Mb) or hemoglobin (Hb) is true? At this partial pressure of oxygen, neither Hb nor Mb would be fully saturated with oxygen. At this partial pressure of oxygen, both Hb and Mb would be equally saturated with oxygen. At this partial pressure of oxygen, Mb would be almost completely saturated but Hb would not. At this partial pressure of oxygen, Hb would be completely saturated but Mb would not.
Look at the periodic table to find the charge on atoms. Magnesium is +2 and Nitrogen is -3. Since there are two nitrogen charge 2*-3 = -6 there needs to be 3 Mg then (3*2+ = 6+) to pair with the two nitrogen. 3 Mg(+2) + 2 N(-3) = Mg3N2
The coefficient next to each reactant represents the amount of moles. The compound for oxygen is O2 and the compound for aluminum is 4. We can see that the number next to O2 is 3 and the number next to aluminum is 4.