- If 0.334 moles of iron react with O2 how many moles of O'2 are required? Study guide help.?

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In one mole of the compound iron(III) oxide,
what fraction of the total number of ions is
the oxygen ion? What is 4 x 6? Number Theory: Find the roots of 4x^2+6x+1 in Z11 (could you please explain step by step? THANKS!)? Diameter of a wheel 80cm. If the wheel rotates through an angle of 200degrees, how many cm does it move? Show steps please!? Could someone help me with these math problems? I can't figure them out. Solve the linear equation;
x+2y=15
y=-2x+0 9x-12y=-3
-12x+16y=4?