In: Chemistry
Potassium cyanide (KCN) reacts with acids to form a deadly poisonous gas, hydrogen cyanide (HCN). The reaction is represented by the equation:
KCN(aq) + HCl(aq) è KCl(aq) + HCN(g)
If a sample of 0.150 g of KCN is treated with an excess of HCL, calculate the amount of HCN produced, in grams.
KCN(aq) + HCl(aq) ------> KCl(aq) + HCN(g)
calculate the moles of KCN using weigt / molar mass formula
moles of KCN = 0.15 / 65.12
= 0.0023 moles
from reaction it is clear that one mole of KCN will produce one mole of HCN
0.0023 moles of KCN produce 0.0023 moles of HCN
weight of HCN = moles of HCN x molar mass of HCN
= 0.0023 x 27.03
= 0.0623 grams.