B. Determination of R. 160 1. Mass of zinc 2. Moles of zinc 3. Moles of hydrogen

Question

B. Determination of R. 160 1. Mass of zinc 2. Moles of zinc 3. Moles of hydrogen 4. Volume of water collected (mL) 5. Volume of water collected (Liters) 6. Temperature of water collected C) 7. Temperature of water collected (K) 8. Atmospheric pressure (mm) 9. Vapor pressure of water (mm, from table, p. 214) 10. Corrected pressure of hydrogen (mm) 11. Corrected pressure of hydrogen (atm) 12. Experimentally calculated value of R 13. Literature value of R 14. Percent error 15. Suggest reasons for the percent error (#14) 24, ? 16. Suggest any ways you can think of to improve any part(s) of this experiment. 17. Some of the Learning Objectives of this experiment are listed on the first page of this experiment. Did you achieve the Learning Objectives? Explain your answer. 2015 Cengage Learning All Rights Reserved. Miny sot be scanned, copied or duplicated, or posted to a poblicly acessible webaie, ib whole or in part custom page 36

Explanation / Answer

9 - Vapor pressure of water at 24C = 22.4 mmHg

10 - corrected pressure of H2 = Barometric pressure - Vapor pressure of water

= 763.7 - 22.4

= 741.3 mmHg

11 - corrected pressure of H2 in atm

= 741.3 mmHg x 1atm/760mmHg

= 0.9754 atm

12 - from the ideal gas equation

Experimental Gas constant R = PV/nT

= 0.9754 atm x 0.375 L / 0.0147 mol x 297 K

= 0.08377 L-atm/mol-K

13 - Literature value of R = 0.0821 L-atm/mol-K

14 - % error

= (experimental value - Literature value) *100/Literature value

= (0.08377 - 0.0821) *100/0.0821

= 2.05%

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