2005 hsc paper (1 Viewer)

[antonio mkds]

i need answer for number 22 in the 2005 hsc paper pls its ergent thanks

http://www.boardofstudies.nsw.edu.au/hsc_exams/hsc2005exams/pdf_doc/chemistry_05.pdf



thanks

 

[Lucid Scintilla]

It's easier if you just posted the question/frame capture of the question... not everyone's going to download the PDF...

 

[xiao1985]

ain't you gonna answer the question nerdy lucid?!

any way, i believe you can do the graphing yourself, it's just math...

b) 380mL of H2 gas.... because it is obvious that at 1.22g of zinc, all HCl in solution would have being used up... and HCl became the limiting reagent... adding additional non limiting reagent won't cause the reaction go further...

c) 0.56g of zinc, = 0.56 / 65.39 = 8.56mmol (n = m/Mm rule)
n = V/mV ... 0.00856 x 24.79 = 0.212 L