How many moles of Oxygen are needed to form 122 moles of Fe2O3?

As you move from right to left on the periodic table the atomic radius fill in the blank

2pos suppose an object in free fall is dropped from a building. its starting velocity is 0 m/s. ignoring the effects of air resistance, what is the speed (in m/s) of the object after falling 3 seconds? give your answer as a positive decimal without units. answer here

What is the percentage of hydrogen in nitrogen trihydride