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Tanzania [10]
3 years ago
15

When do phase transitions occur in molecules? only when energy is withdrawn when energy is supplied or withdrawn only when energ

y is supplied when energy is neither supplied nor withdrawn
Chemistry
2 answers:
Elden [556K]3 years ago
8 0

when energy is supplied or withdrawn

V125BC [204]3 years ago
4 0

A phase transition or phase change refers to <u>transitions between solid, liquid and gaseous states of matter.</u> A phase of a thermodynamic system and the states of matter have uniform physical properties.

<u>During a phase transition certain properties of the medium change</u>, often discontinuously, as a result of the <em>change of some external condition</em>, such as temperature, pressure or others.  In this way,<u> a phase transition occurs when energy is supplied or withdrawn from the system in which the material is located. </u>

For example, when we want the water to <u>boil</u> (going from liquid to gaseous state) we <em>supply energy</em> in the form of heat to change its state. On the other hand, when we want to produce <u>ice</u>, we put liquid water in a container that we then put in the freezer that is at a very low temperature, around 0 ºC. By placing the water at a lower temperature the kinetic energy of the water molecules decreases (<em>it is removed from the system</em>) and these molecules are ordered to form a solid (the ice).

Thus, a phase transition occurs when energy is supplied or removed from the molecules.

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Nitrogen dioxide reacts with water to form nitric acid and nitrogen monoxide according to the equation: 3NO2(g)+H2O(l)→2HNO3(l)+
Vera_Pavlovna [14]

Answer:

5 moles of NO₂ will remain after the reaction is complete

Explanation:

We state the reaction:

3NO₂(g) + H₂O(l) → 2HNO₃(l) + NO(g)

3 moles of nitric oxide can react with 1 mol of water. Ratio is 3:1, so we make this rule of three:

If 3 moles of nitric oxide need 1 mol of water to react

Then, 26 moles of NO₂ may need (26 .1) / 3 = 8.67 moles of H₂O

We have 7 moles of water but we need 8.67 moles, so water is the limiting reactant because we do not have enough. In conclusion, the oxide is the reagent in excess. We can verify:

1 mol of water needs 3 moles of oxide to react

Therefore, 7 moles of water  will need (7 .3)/1 = 21 moles of oxide

We have 26 moles of NO₂ and we need 21, so we still have oxide after the reaction is complete. We will have (26-21) = 5 moles of oxide that remains

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2 years ago
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Answer:

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You may, but it is too risky.

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