How many moles of Na are required to make 2.4 moles Fe?
_Na + _Fe(2)O(3) - _Na(2)0 + _Fe

7.2 moles of Na are required to make 2.4 moles of Fe.

Explanation:

The balanced  chemical equation is:

According to stoichiometry:

2 moles of Fe are produced from = 6 moles of Na

Thus 2.4 moles of Fe are produced from = moles of Na.

Thus 7.2 moles of Na are required to make 2.4 moles of Fe.

explanation: it gains negative electrons, therefore becoming negatively charged. as charge cannot be created, nor destroyed, only transferred, this leaves the wool positive. now that they have opposite charges, the two items attract.

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.