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3 years ago

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Chemistry

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Alborosie3 years ago

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Explanation:

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A solid mixture consists of 47.6g of KNO3 (potassium nitrate) and 8.4g of K2SO4 (potassium sulfate). The mixture is added to 130

IgorLugansk [536]

Answer: No crystals of potassium sulfate will be seen at 0°C for the given amount.

Explanation:

We are given:

Mass of potassium nitrate = 47.6 g

Mass of potassium sulfate = 8.4 g

Mass of water = 130. g

Solubility of potassium sulfate in water at 0°C = 7.4 g/100 g

This means that 7.4 grams of potassium sulfate is soluble in 100 grams of water

Applying unitary method:

In 100 grams of water, the amount of potassium sulfate dissolved is 7.4 grams

So, in 130 grams of water, the amount of potassium sulfate dissolved will be $\frac{7.4}{100}\times 130=9.62g$

As, the soluble amount is greater than the given amount of potassium sulfate

This means that, all of potassium sulfate will be dissolved.

Hence, no crystals of potassium sulfate will be seen at 0°C for the given amount.

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Which tool can be used to measure the volume of a liquid to one decimal place?

pentagon [3]

The tool to measure the liquid is a measuring cylinder.

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What is the mass of 4 moles of helium, He?

aniked [119]

I am pretty sure it is 4.002602

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Why doesn’t a broken wineglass spontaneously fix itself, from a thermodynamic point of view?

Alla [95]

The answer is the option 3.) Fixing a wineglass requires a large decrease in entropy.

Entropy is a termodynamical variable and it is defined as the degree of disorder of the system.

As per the second law of thermodynamics the spontaneous changes only occur when the entropy increases.

Fixing the broken glasses by itself meant to decrease the entropy spontaneusly which violate the principle or second law of thermodynamics. So, it is not possible.

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Why do you think dark surfaces absorb radiation better than light surfaces?

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