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AfilCa [17]
3 years ago
9

In the compound cah2 calcium has an oxidation number of 2+ and hydrogen has an oxidation number of

Chemistry
1 answer:
sesenic [268]3 years ago
7 0

The oxidation number of H is -1.

Sum of the oxidation numbers in each element = charge of the complex

CaH₂ has 1 Ca atom and 2H atoms. The charge of the complex is zero. Let’s say Oxidation number of H is "a".

Then,

<span>    (+2) + 2 x a = 0 </span>

<span>        +2  + 2a  = 0</span>

                  2a = -2

                    a = -1

Hence, the oxidation number of Hydrogen atom in CaH₂ is -1


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Answer please and thank you
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Answer:

Option B. 30 KJ.

Explanation:

The following data were obtained from the question:

Temperature (T) = 5000 K

Enthalpy change (ΔH) = – 220 kJ/mol

Change in entropy (ΔS) = – 0.05 KJ/mol•K

Gibbs free energy (ΔG) =...?

The Gibbs free energy, ΔG can be obtained by using the following equation as illustrated below:

ΔG = ΔH – TΔS

ΔG = – 220 – (5000 x – 0.05)

ΔG = – 220 – (– 250)

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ΔG = 30 KJ

Therefore, the Gibbs free energy, ΔG is 30 KJ.

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What is the Energy of a wave whose frequency is 8.45 x 10^14 Hz?
allsm [11]

Answer:

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