A chemist has to prepare 750.0 mL of a 0.200 M KNO3(aq) solution. What mass, in grams, of potassium nitrate (formula mass 101.11 g/mol) would they use

They would use 15.17 g KNO₃.

Explanation:

To solve this problem first we calculate the number of KNO₃ moles that would be in the solution, multiplying the concentration times the volume:

750 mL ⇒ 750 / 1000 = 0.750 L

Then we convert moles of KNO₃ to grams, using its molar mass:

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.

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