Use the data below obtained when 5.00 g of zinc were reacted with various amount
ID: 532498 • Letter: U
Question
Use the data below obtained when 5.00 g of zinc were reacted with various amounts of 2.0 M HCI and the graph to answer the questions that follow. Zn(s) + 2 HCI(aq) rightarrow ZnCl_2(aq) + H_2(g) Which reactant is limiting the amount of H_2 produced in the region of the graph labeled A? ______ Region B? _______ How many grams of hydrogen gas can be produced if 200.0 mL of 2.0 M HCI are reacted with 5.00 grams of zinc? How many grams of Zn are required to completely react with 200.0 mL of 2.0 M HCI? How many grams of H_2 can be produced? (use back of this page if necessary)Explanation / Answer
1) Given reaction shows that there is a linear dependence up to the 80 mL of HCl (2M) addition.
further addition of HCl solution lead to the saturation(means that there is no further reaction with Zn) and all the Zn reacted completely. Therefore, the limiting reactant is Zn.
Label A is the linear dependence mass of H2 vs volume of HCl added.
Label B: It is the saturation line, where there is no further reaction. All the Zn is converted to ZnCl2.
2) Volume of HCl added = 200 mL
from the graph, it shows that the saturation point is 80 mL.
Therefore, the mass of H2 gas = 0.150 g
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