14. (12 points total) The following reaction is used in some labs to produce gre

Question

14. (12 points total) The following reaction is used in some labs to produce greenhouse gas: CaCO3(s) + 2HCl(aq) ? CaCl2(aq) + H2O(l) + CO2(g) a) (6 pts) In an experiment 25.0 mL of 1.00M HCl and 1.73g of CaCO3 were used. How much CO2 in grams can form? Show your work: Answer: ____________ g I know how to to A. b) (6 pts) In another experiment CO2 gas was collected over water. Its volume measured at 20.0 oC and 750. mm Hg was 0.153L. What is the percent yield of CO2 if the expected theoretical yield is 8.11

Explanation / Answer

CaCO3(s) + 2HCl(aq) ------>CaCl2(aq) + H2O(l) + CO2(g) Moles of HCl = 0.025 moles of CaCO3 = 0.0173 0.0173 moles of CaCO3 requires = 2 x 0.0173= 0.0346 mol HCl so HCl is limiting reagent 2moles give 1 mol CO2 a) 0.025 will give = 0.025/2 moles CO2 = 0.025/2 x 44 = 0.275 g CO2 b)n= PV/RT = 6.27666 x 10^-3 moles so yield =theoritical - actual / theoritical = 49.786 %

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