Thursday
April 24, 2014

Homework Help: chemistry

Posted by Yuli on Thursday, November 24, 2011 at 12:14am.

A student generates H2(g) over water using the reaction between zinc and hydrochloric acid

Zn(s)+ 2HCl(aq)---> ZnCl2(aq)+ H2(g)

Data:
Mass of vial and zinc 15.5082
mass of vial 15.3972
mass of zinc 0.111
final burette reading 45.30mL
barometric pressure: Patm 100.6kPa
temperature of trapped gas 24.3C
vapour pressure of water at 24.3 C: PH2O 3.004kPa
diff in solution lvls inside and outside burette 162mm H2O

I got 95.968 kPa of H2 since you said im allowed 4 sigfig i used 95.97 does that seem right?
and for the second part i got 297.5K im really not sure what am doing here the formulas i was trying to use were
atm = H2+ H2O+ lvldiff
H2= atm- lvldiff-H2O

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