We’re being asked to calculate for the mass of potassium sulfide(K2S) that reacted.
Reaction: 2 HCl(aq) + K2S(aq)⟶H2S(g) + 2 KCl(aq)
We’re going to calculate the mass of potassium sulfide using the following steps.
Step 1. Calculate the moles of H2S produced using the ideal gas equation.
P = pressure, atm
V = volume, L
n = moles, mol
R = gas constant = 0.08206 (L·atm)/(mol·K)
T = temperature, K
Step 2. Calculate the moles of H2S that reacted using mol to mol comparison.
Step 3. Calculate the mass of H2S that reacted using its molar mass.
When hydrochloric acid is poured over potassium sulfide, 43.1 mL of hydrogen sulfide gas is produced at a pressure of 754 torr and 25.8 oC.
Determine how much potassium sulfide (in grams) reacted.