How many moles of Fe are needed for the reaction of 12.0
moles of O2?

The balanced reaction equation is:

4

F

e

(

s

)

+

3

O

2

(

g

)

→

2

F

e

2

O

3

(

s

)

Initial moles of oxygen reactant (given) =  

12.0

m

o

l

According to the balanced equation the iron and oxygen reactants combine in a 4:3 molar ratio. Therefore for complete consumption of both reactants we require:

Initial moles of iron reactant =  

4

3

×

12.0

m

o

l

=

16.0

m

o

l

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

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