What is the formula unit for a compound made from Fe3+ and oxygen?

Chemistry

2 answers:

Oxana [17]3 years ago

8 0

Answer : The correct option is, $Fe_2O_3$

Explanation :

Formula unit of a compound is defined as the minimum number ratio of ions represented in the compound.

The valency of iron is (+3) and the valency of oxygen is (-2). By the criss-cross method the $Fe^{+3}$ cation combine with the $O^{2-}$ anion, it will give $Fe_2O_3$ .

$Fe^{+3}+O^{2-}\rightarrow Fe_2O_3$

The formula by criss-cross method is shown below.

Alexeev081 [22]3 years ago

6 0

Fe2O3 because O has a -2 charge and Fe and +3, you want the charges to equal each other so if you have 2 Fe with +3 charge the charge becomes 6 if you have 3 O with -2 charge the charge becomes 6.

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What is the total number of oxygen atoms represented in the formula na2c03.10h2o?

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As per the given chemical formula- Na2CO3.10H2O, one mole of the chemical compound contains 13 moles of oxygen atoms. Hence

Number of moles of oxygen atoms in one mole of Na2CO3.10H2O = 13

number of moles of oxygen atoms in 0.2 moles of Na2CO3.10H2O = 13 X 0.2 = 2.6

Now, one mole of a substance contains 6.022 X 10^23 particles of the substance. Thus

number of atoms of oxygen in one mole of oxygen atom = 6.022 X 10^23

number of moles of oxygen atoms in 2.6 moles of oxygen atoms = 2.6 X 6.022 X 10^23 = 15.657 X 10^23

= 1.566 X 10^24

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