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3 years ago

Which substance is the most soluble at 60 degrees Celsius? How do you know?

Chemistry

1 answer:

Sonja [21]3 years ago

3 0

Answer:

NH4CL is the answer

Explanation:

Hope it helps you

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Illustrate: The Avogadro constant is so large it is normally written in scientific notation. To

omeli [17]

Answer:

602200000000000000000000

Explanation:

move the decimal place over 23 places to the right

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3 years ago

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H2(g) + F2(g)2HF(g) Using standard thermodynamic data at 298K, calculate the entropy change for the surroundings when 2.20 moles

abruzzese [7]

<u>Answer:</u> The value of $\Delta S^o$ for the surrounding when given amount of hydrogen gas is reacted is -31.02 J/K

<u>Explanation:</u>

Entropy change is defined as the difference in entropy of all the product and the reactants each multiplied with their respective number of moles.

The equation used to calculate entropy change is of a reaction is:

$\Delta S^o_{rxn}=\sum [n\times \Delta S^o_{(product)}]-\sum [n\times \Delta S^o_{(reactant)}]$

For the given chemical reaction:

$H_2(g)+F_2(g)\rightarrow 2HF(g)$

The equation for the entropy change of the above reaction is:

$\Delta S^o_{rxn}=[(2\times \Delta S^o_{(HF(g))})]-[(1\times \Delta S^o_{(H_2(g))})+(1\times \Delta S^o_{(F_2(g))})]$

We are given:

$\Delta S^o_{(HF(g))}=173.78J/K.mol\\\Delta S^o_{(H_2)}=130.68J/K.mol\\\Delta S^o_{(F_2)}=202.78J/K.mol$

Putting values in above equation, we get:

$\Delta S^o_{rxn}=[(2\times (173.78))]-[(1\times (130.68))+(1\times (202.78))]\\\\\Delta S^o_{rxn}=14.1J/K$

Entropy change of the surrounding = - (Entropy change of the system) = -(14.1) J/K = -14.1 J/K

We are given:

Moles of hydrogen gas reacted = 2.20 moles

By Stoichiometry of the reaction:

When 1 mole of hydrogen gas is reacted, the entropy change of the surrounding will be -14.1 J/K

So, when 2.20 moles of hydrogen gas is reacted, the entropy change of the surrounding will be = $\frac{-14.1}{1}\times 2.20=-31.02J/K$

Hence, the value of $\Delta S^o$ for the surrounding when given amount of hydrogen gas is reacted is -31.02 J/K

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3 years ago

Which of the following is insoluble in water? NaCl; Cu(OH)2; AgNO3; K2SO4

kvv77 [185]

Cu(OH)2 is insoluble in water

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4 years ago

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A source emits a sound and is represented by the red dot in this map. Four people are located around the source, and the circles

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Explanation:

A source Emits a sound and is represented by the red dot in this map. Four people are located and the source and the circle represent the sound wave.

As the source moves west which person hears the highest pitch

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answer is attached in the image below

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3 years ago

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