Asample of a compound of xenon and fluorine contains molecules of a single type; xefn, where n is a whole number. if 5.0 x 1020 of these xefn molecules have a mass of 0.172 g, what is the value of n?

4

Explanation:

Avogadro’s number represent the number of the constituent particles which are present in one mole of the substance. It is named after scientist Amedeo Avogadro and is denoted by .

Also, it is the number of particles in exactly 12.000 g of isotope carbon 12.

Avogadro constant:-

Hence,

Mass of = 131.293+ n18.998 g

So,

 molecules have a mass of 131.293+ n18.998 g

Also,

 molecules have a mass of g

So,

 molecules have a mass of g

Also, given mass = 0.172 g

Thus,

Thus, value of n is 4.

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answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.