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3 years ago

A solution that has reached equilibrium and has undissolved solute remaining in the solution must be

1 answer:

3 0

Answer : A solution that has reached equilibrium and has undissolved solute remaining in the solution must be, saturated solution.

Explanation :

Unsaturated solution : It is defined as the solution in which more solute particles can be dissolved in the solvent.

Saturated solution : It is defined as the solution in which no more solute particles can be dissolved in the solvent.

As per question, when a solution reached to equilibrium and some amount of undissolved solute remaining in the solution that means no more solute can be dissolved in the solvent then that solution will be saturated solution.

Hence, the solution must be saturated solution.

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Using the standard enthalpies of formation for the chemicals involved, calculate the enthalpy change for the following reaction.

Firlakuza [10]

Answer: -134 kJ

Explanation:

The balanced chemical reaction is,

$3NO_2(g)+H_2O(l)\rightarrow 2HNO_3(aq)+NO(g)$

The expression for enthalpy change is,

$\Delta H=\sum [n\times \Delta H_f(product)]-\sum [n\times \Delta H_f(reactant)]$

$\Delta H=[(n_{HNO_3}\times \Delta H_{HNO_3})+(n_{NO}\times \Delta H_{NO})]-[(n_{H_2O}\times \Delta H_{H_2O})+(n_{NO_2}\times \Delta H_{NO_2})]$

where,

n = number of moles

Now put all the given values in this expression, we get

$\Delta H=[(2\times -207)+(1\times 90)]-[(1\times -286)+(3\times 32)]$

$\Delta H=-134kJ$

Therefore, the enthalpy change for this reaction is, -134 kJ

6 0

3 years ago

You have decided to do a science fair project involving plants. Which of the following represents a well-stated hypothesis?

marysya [2.9K]

The correct answer should be c

8 0

3 years ago

Read 2 more answers

Can someone help me?

Leto [7]

Answer:

oh sorry i cant but i might think the answer is adaptive but if not someone correct me and ill change this response hope that i could help

Explanation:

7 0

4 years ago

Which property describes a mixture? Check all that apply.

jeka94

Answers are:

1) It can be separated by physical methods.

2) It can appear different from different sources.

3) It cannot be described by a chemical symbol or formula.

Mixture is composed of at least two substances.

Pure substance is made of only one type of atom (element) or only one type of molecule (compound), mixtures and solutions are made from two or more types of pure substances.

Mixtures can be separeted y physical means, while compounds cannot.

There is a definite recipe to make each mixture, because composition of mixture can vary.

4 0

3 years ago

Read 2 more answers

In the gizmo what light intensity in CO2 level do you think will maximize the rate photosynthesis

Phoenix [80]

<span>Carbon dioxide is one of the important factor in photosynthesis. It helps photosynthesis to take place and it will increase its rate provided the Oxygen supply level at night remains constant.It would probably keep increasing up to 100 percent assuming the light was on. The plant probably needs O2 at night. They generally don't make greenhouses more than about 1000 ppm because the improvement isn't worth the cost of pumping in all that extra CO2. The amount of light that the plant absorbs limits the benefit so it won't increase in proportion to the amount of CO2 past a certain point. It wouldn't be much improvement past about 5000 ppm from what I have heard before.</span>

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4 years ago