B. Determination of R. 0, 0150 1. Mass of zinc 2. Moles of zinc 3. Moles of hydr

Question

B. Determination of R. 0, 0150 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 ofwater collected(0) 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 .2 0. 46 0 243 K 175 15. Suggest reasons for the percent error (#14) 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. ©2015Cawe Leam ng AllRighs Reserved May not be scanted, "p dordapli led, tr po lidtoaphlely custom page

Explanation / Answer

Q10

corrected pressure can be given by:

Pgas corrected = Patmospheric - Pvapor

Pgas = 764 - 17.5 mm Hg

Pgas = 746.5 mm Hg

Q11

now change to atm via

760 mm Hg = 1 atm

746.5 mm Hg = x atm

x = 746.5/760

x = 0.9822 atm

Q13,

get R

PV = nRT

R = PV/(nT)

R = (0.9822 )(0.46)/(0.015*(293))

R = 0.102801 Latm/molK

Q14

% error is given by

% error = (Theoretical- Experimental) /Theoretical* 100%

% error = (0.0821- 0.102801) /0.0821* 100% = 25% error

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