What is the wavelength of radiation that has a frequency of 5.9×1011 s−1 ?
1 answer:
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<u>Answer: </u>The number of moles of excess reagent left is 0.750 moles
<u>Explanation:</u>
The number of moles is calculated by using the equation:
......(1)
- <u>For KI:</u>
Given mass of = 249 g
Molar mass of = 166 g/mol
Putting values in equation 1, we get:
- <u>For </u>
<u>:</u>
Given mass of = 496.5 g
Molar mass of = 331 g/mol
Putting values in equation 1, we get:
The given chemical equation follows:
By stoichiometry of the reaction:
If 2 moles of KI reacts with 1 mole of lead(II) nitrate
So, 1.5 moles of KI will react with = of lead(II) nitrate
As the given amount of lead(II) nitrate is more than the required amount. Thus, it is present in excess and is considered as an excess reagent.
Thus, KI is considered a limiting reagent because it limits the formation of the product.
Moles of excess reactant () left = [1.5 - 0.75] = 0.750 moles
Hence, the number of moles of excess reagent left is 0.750 moles