Chemistry Lab! Please help!!?

Posted on 2015-11-26 07:27:00 in Chemistry by JILLIAN

5. Add 0.25 g of zinc (Zn) from the Materials shelf to the Erlenmeyer flask.
6. Watch for evidence of the reaction between the zinc and HCl (pay close attention to the mixture immediately after adding the zinc). Record all of the indications that the reaction has occurred in you Lab Notes.
**81.4F 1.69 atm bubbles w/ decreasing temp, returns to 70.7F 92.2Volume** data after 5&6

11. Repeat the experiment with a new Erlenmeyer flask and gas syringe, using 10 mL of HCl and 0.5 g of zinc. The pressure will gradually decrease until it equalizes. **33.4C 2.40atm 184.5V data after*
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Questions:
How many moles of zinc reacted with the 6M HCl in the first part of the experiment? To find the moles of zinc you need to convert from the grams of zinc to the moles of zinc using the following calculation: moles of Zn = g of zinc * (1 mol Zn/molecular weight of Zn)

A. 2615.2 moles
B. 1.5 moles
C. 3.82 x 10^-3 moles
D. 1.58 x 10^-5 moles

How many moles of H2 were produced in the first part of the experiment? Notice from the reaction given in the procedures that for every mole of zinc, there is one mole of H2 produced.

A. 1.58 x 10^-5 moles
B. 1.5 moles
C. 3.82 x 10^-3 moles
D. 2615.2 moles

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