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faust18 [17]
3 years ago
7

Why is the enthalpy of formation of oxygen zero?

Chemistry
1 answer:
madreJ [45]3 years ago
4 0
All elements in their standard states (oxygen<span> gas, solid carbon in the form of graphite, etc.) have a standard </span>enthalpy of formation<span> of </span>zero<span>, as there is no change involved in their </span>formation<span>.</span>
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How many valence electrons do the alkaline earth metals have?
fenix001 [56]

Answer:

\boxed{2}

Explanation:

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3 years ago
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Yuliya22 [10]
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Calculate the χacetone and χcyclohexane in the vapor above the solution. p°acetone = 229.5 torr and p°cyclohexane = 97.6 torr.
Ulleksa [173]
First calculate the mole fraction of each substance:
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Cyclohexane: 1.45 ÷ (2.88 mol + 1.45 mol) = 0.335
Raoult's Law: P(total) = P(acetone) · χ(acetone)  + P(cyclohexane) · χ(cyclohexane).
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7 0
3 years ago
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What is the percent of Cr in Cr2O3
IgorLugansk [536]
The percentage of Chromium in Chromium Oxide is calculated as follow,

Step 1:
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Step 2:
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i.e.
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3 years ago
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Lyrx [107]
Schrödinger found the quantum mechanical model of the atom after Bohr’s model.
It is better than Bohr’s model because you can use mathematical equations to find electrons certain position. Unlike Bohr’s which is just a “cloud” where the an electron could possibly be.
8 0
3 years ago
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