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3 years ago

What is the oxidation state of each element in SO4(2–)?

Chemistry

1 answer:

nikklg [1K]3 years ago

3 0

Answer:

The oxidation state of sulfur, S, is +6, and the oxidation state of oxygen, O, is - 2:

S: 6+

O: 2-

Explanation:

Application of rules

1. Ion SO₄²⁻

In a neutral compound, the sum of the oxidation states of all the atoms that constitute the compound is equal to zero. In ions the sum of the oxidation states of the atoms is equal to the charge of the ion.

In this case, the ion SO₄²⁻ has charge negative 2: - 2

2. Oxygen

With the exception of the peroxides, when oxygen is combined with other elements, it always has oxidation state - 2.

Hence, the total charge of the four atoms of oxygen in SO₄²⁻ is 4×(-2) = - 8.

3. Sulfur

Therefore, naming x the unknown oxidation state of S, you can set this equation:

x + ( - 8) = - 2
⇒ x = - 2- ( - 8) = - 2 + 8 = + 6

Conclusion

In SO₄²⁻, the oxidation state of sulfur, S, is +6, and the oxidation state of oxygen, O, is - 2.

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Gallium oxide, Ga.Oy, forms when gallium is combined with oxygen. A 1.25 g of Ga is allowed to react with excess oxygen and 1.68

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Mass of oxygen = 1.68 - 1.25 = 0.43 g

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Step 1 : convert given masses into moles.

Moles of Ga = $\frac{\text{ given mass of Ga}}{\text{ molar mass of Ga}}= \frac{1.25g}{69.72g/mole}=0.0179moles$

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Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For Ga = $\frac{0.0179}{0.0179}=1$

For O = $\frac{0.027}{0.0179}=1.5$

The ratio of Ga : O = 1 : 1.5

To make in whole number we multiple ratio by 2, we get:

The ratio of Ga : O = 2 : 3

The mole ratio of the element is represented by subscripts in empirical formula.

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The empirical formula weight = 2(69.72) + 3(16) = 187.44 gram/eq

Now we have to calculate the molecular formula of the compound.

Formula used :

$n=\frac{\text{Molecular formula}}{\text{Empirical formula weight}}$

$n=\frac{187.44}{187.44}=1$

Molecular formula = $(Ga_2O_3)_n=(Ga_2O_3)_1=Ga_2O_3$

Therefore, the chemical of the compound is, $Ga_2O_3$

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