9. (6 pts) Hydrochloric acid reacts with sodium sulfide in solution to form a fa

Question

9. (6 pts) Hydrochloric acid reacts with sodium sulfide in solution to form a fairly pungent (and somewhat toxic) gas called hydrogen sulfide (H2S) according to the following balanced chemical equation. Assume that H2S behaves as an ideal gas under the experimental conditions. 2HCl(aq) + Na2S(aq) 2HS(g) + 2NaCl(aq) When 0.15L of 2.57M HCl is mixed with 0.12L of 4.25M Na2S, the gas is collected in a 750mL container at room temperature (22°C). What is the final pressure of the gas (H2S) (in atm)? 750 mL. IL

Explanation / Answer

mol of HCl = MV = 0.15*2.57 = 0.3855

mol of Na2S = MV = 0.12*4.25 = 0.51

ratio is 2:1 so

0.3855 mol of HCl is limiting, it will form --> 2:2 ratio --> 0.3855 mol of H2S

then

PV =nRT

P = nRT/V

P = (0.3855)(0.082)(22+273)/0.750

P = 12.43 atm

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