Określ, ile gramów chlorku amonu NH4Cl należy rozpuścić w 300g wody w temperaturze 70oC, aby otrzymać roztwór nasycony.

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Explanation:

The translation of the question is:

Specify how many grams of NH₄Cl, ammonium chloride, should be dissolved in 300g of water at 70ºC to obtain a saturated solution.

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The file attached shows the graph with the solubility curves for a number of solutes in water.

There, I show you the solubility of a solution of NH₄Cl at 70ºC: it is about 62g of NH₄Cl per 100 grams of water.

Then, the amount of  NH₄Cl in 300g of water at that temperature is calculated using proportions:

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.