2015 Name: Lab Instructor 1. In the reaction indicated below, if solid zinc was

Question

2015 Name: Lab 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. the molar mass of zinc. moles of zinc consumed. grams of zinc chloride formed. b. Because the molar mass of zinc chloride is greater than c. Because there are more moles of zinc chloride made than d. Because the zinc chloride was wet; there should be fewer 3. a. The volume of a fixed quantity of air is directly proportional to the absolute temperature only if the pressure of the sample remains constant. Explain why we carn 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? 4. 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.

Explanation / Answer

Ans 1 :

Since solid Zinc was left in the test tube , after the reaction has been completed , so it cannot be the limiting reagent .

So the limiting reagent will be HCl , as it got exhausted before Zinc could finish completely.

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