Potassium iodide (ki) is often added to table salt as a dietary source of iodine. how many moles of ki are contained in 1.00 lb of table salt containing 0.0073% ki by mass?
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mol

0.0002 moles if KI

Explanation:

First we need to transform lb in grams

1 lb = 453.6 grams

Now we need to find the quantity of KI in table salt

mass KI = concentration × table salt mass

mass KI = (0.0073 / 100) × 453.6 = 0.0331 grams

Now we calculate the number of moles of KI with the following formula:

number of moles = mass / molecular weight

number of moles = 0.0331 / 166 = 0.0002 moles if KI

yes

explanation:

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since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.