Instructor: 1. In the reaction indicated below, if solid zinc was left in the te

Question

Instructor: 1. In the reaction indicated below, if solid zinc was left in the test tube after standing in your drawer for one week, what is the limiting reactant? Zn + 2 HCI à ZnCl, + H 2. Why is the mass of the zinc chloride formed greater than the mass of zinc that is consumed? a. Because zinc is the limiting reactant. b. Because the molar mass of zinc chloride is greater than the molar mass of zinc. c. Because there are more moles of zinc chloride made than moles of zinc consumed. d frmese tbr dinf ohndewas et, there should be fewer 3. The volume of a fixed quantity of air is directly a. proportional to the absolute temperature only if the pressure of the sample remains constant. Explain why we can assume this to be true based on the design of the tube and oil plug used in your experiment. b. What would you expect to happen if both ends of the tube were sealed? At 40°C, the oil plug was at 14.0cm. Assume the volume increases 1.5 cm for every 10°C increase and the relationship between temperature and volume is linear throughout the experiment. Calculate the position of the oil plug at 90°C 4.

Explanation / Answer

Ans 1 :

Since Zinc is left in the test tube even after the completion of reaction , it is not the limiting reagent but the excess reagent.

HCl got used up completely , before all of the zinc could react , so HCl is the limiting reagent .

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