Question

How many atoms are present in 39.1 g potassium?

Answer 1

There are 20 neutrons in an average atom of potassium. This is found by subtracting the atomic number (number of protons) from the atomic mass (measured in AMU, which is the approximate weight of a proton or neutron). Rounded to the nearest whole number, this will give you an estimate of how many neutrons are in an average atom of potassium. However, sometimes an atom has more or less neutrons than this number. That is why this number is an approximation instead of an exact value.

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Answer 2

39.1 g of K ( potassium ) will contain 1.6022× 10^ 23 atoms.