A substance composed of two or more elements in a fixed, definite proportion is
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<u>Answer:</u> The mass of hydrogen cyanide formed is 0.17 grams
<u>Explanation:</u>
To calculate the number of moles, we use the equation:
.....(1)
Given mass of KCN = 0.420 g
Molar mass of KCN = 65.12 g/mol
Putting values in equation 1, we get:
The given chemical equation follows:
As, hydrochloric acid is present in excess. So, it is considered as an excess reagent.
Thus, potassium cyanide is a limiting reagent because it limits the formation of products.
By Stoichiometry of the reaction:
1 mole of potassium cyanide produces 1 mole of hydrogen cyanide.
So, 0.0064 moles of potassium cyanide will produce = of hydrogen cyanide
Now, calculating the mass of hydrogen cyanide from equation 1, we get:
Molar mass of HCN = 27.02 g/mol
Moles of HCN = 0.0064 moles
Putting values in equation 1, we get:
Hence, the mass of hydrogen cyanide formed is 0.17 grams