The experiment described in the procedure was performed using a sample of Zinc w
ID: 561718 • Letter: T
Question
The experiment described in the procedure was performed using a sample of Zinc with HCllaq). The lab conditions were 27.00 °C, and 731.0 torr barometric pressure. 149.0 mg of Zinc (MM: 65.39 g/mol) was reacted with 20.00 mL of 1.00M HCKaq). 63.049 g of water was collected when the reaction was complete, and it required 20.48 mL of 0.7500 M NaOH(aq) to titrate the reaction mixture. Water at 27.00 °C has a density of 0.9965 g/cm3, and a vapor pressure of 26.80 torr The value for R is 0.082058 L atm/mol K What is the pressure of H2(g) collected?Explanation / Answer
Zn(S) + 2 HCl(aq) ----> Zncl2 + H2
No of mol of Zn = 0.149/65.39 = 0.0023 mol
No of mol of HCl = 20*1/1000 = 0.02 mol
limiting reactant = Zn
no of mol of H2 liberated = 0.0023 mol
pressure of H2 gas = ptotal - pwater
= 731.0-26.8
= 704.2 torr
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