Which of the following reactions is spontaneous?

1 answer:

5 0

Answer is: lumps os sugar dissolving in water.
Sugar has very good solubility in water and it dissolves readily, which is example of a physical change.
Gibbs free energy (G) determines if reaction will proceed spontaneously, if ΔG is negative, reaction is spontaneous (ΔG = ΔH - T·ΔS).
In other examples, reactions are spontaneous in reverse way, for example spontaneous is forming sodium chlorine from sodium metal and chlorine gas, but not sodium chloride forming sodium metal and chlorine gas, because a lot of energy is needed for that reaction.

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Deﬁne atomic numberand mass number. Which can vary without changing the identity of the element?

Volgvan

Explanation:

Atomic number is defined as the number of an element which represents total number of protons.

When an atom is neutral then it means it contains same number of protons and electrons.

On the other hand, atomic mass is defined as the sum of total number of protons and neutrons present in an atom.

Protons of every element remains fixed because it shows the identity of each element but if we change the number of neutrons then also identity of the atom will remain fixed. This is because changing the number of neutrons will not show any change in number of protons.

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Thus, we can conclude that number of neutrons can vary without changing the identity of the element.

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alex41 [277]

First, lets balance the reaction equation:
4Fe + 3O₂ → 2Fe₂O₃
It is visible form the equation that 4 moles of Fe require 3 moles of O₂
Molar ratio Fe/O₂ = 4/3 = 1.33
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Now, we check the molar ratios present:
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