Answer:
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Step-by-step explanation:
To determine the number of particles in 65 grams of potassium iodide (KI), we need to use the Avogadro's constant (NA) and the molar mass of KI.
The molar mass of KI can be calculated by adding the atomic masses of potassium (K) and iodine (I) in one KI molecule. The atomic masses of K and I are 39.10 g/mol and 126.90 g/mol, respectively. Therefore, the molar mass of KI is:
Molar mass of KI = atomic mass of K + atomic mass of I
= 39.10 g/mol + 126.90 g/mol
= 166.00 g/mol
Now we can calculate the number of particles in 65 grams of KI using the following formula:
Number of particles = (mass of sample / molar mass) x Avogadro's constant
Number of particles = (65 g / 166.00 g/mol) x 6.022 x 10^23 particles/mol
= 2.51 x 10^23 particles
Therefore, there are approximately 2.51 x 10^23 particles in 65 grams of potassium iodide (KI).