What is the number of representative particles in .400 mol KCl?

1 Answer
anor277
Apr 1, 2016

There are 0.4 xx N_A potassium cations, and an equal quantity of chloride anions.

Explanation:

But what is N_A? N_A is simply "Avogadro's number", 6.022140857 × 10^23. This number has the property that N_A ""^12C atoms has a mass of 12.00 g precisely. N_A is thus the link between atoms and molecules, about which we can only conceive, and the macro world of grams and kilograms, and litres, that which we can measure in a laboratory.

What is the mass of 0.400 mol KCl, given that KCl has a mass of 74.55*g*mol^-1?

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