How many mols are present in the a sample of silver nitrate which has
5.3x10^24 molecules.

 5.3 x 10^24 formula units of silver nitrate is equivalent to 8.8 moles of silver nitrate. Silver nitrate is an ionic compound, therefore, its representative particle is called a "formula unit" instead of molecule. For every mole of a substance, we know that there are 6.022 x 10^23 representative units of that substance. The amount of particles in one mole of substance is called Avogadro's number.

Further Explanation:

We can convert from number of representative particles to moles using the formula:

For this problem, we can calculate the number of moles by plugging in the given values to the equation above,

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Keywords: moles conversion, Avogadro's number

it is b that is the answer.