Answer:
The balanced chemical equation for the reaction between potassium cyanide (KCN) and hydrochloric acid (HCl) to form hydrogen cyanide (HCN) and potassium chloride (KCl) is:
KCN + HCl → KCl + HCN
To calculate the mass of HCN produced from 1.80 grams of KCN, we first need to determine the limiting reactant, which is the reactant that is completely consumed in the reaction. Since we are given that KCN is present in a limited amount, we can assume it is the limiting reactant.
The molar mass of KCN is 65.12 g/mol. To convert 1.80 grams of KCN to moles, we divide by the molar mass:
1.80 g KCN × (1 mol KCN/65.12 g KCN) = 0.0276 mol KCN
From the balanced equation, we can see that the mole ratio of KCN to HCN is 1:1. Therefore, the number of moles of HCN produced is also 0.0276 mol.
The molar mass of HCN is 27.03 g/mol. To calculate the mass of HCN produced in grams, we multiply the number of moles by the molar mass:
0.0276 mol HCN × (27.03 g HCN/mol) = 0.746 g HCN
Therefore, 1.80 grams of KCN reacting completely with excess HCl produces 0.746 grams of HCN gas.
#CarryOnLearning
Step-by-step explanation: