1) If you mix a solution of SrCl 2 (aq) and K 2 SO 4 (aq) , ____________________
ID: 495239 • Letter: 1
Question
1) If you mix a solution of SrCl2(aq) and K2SO4(aq), __________________________.
a precipitate of K2Sr will be formed
a precipitate of KCl will be formed
no precipitate will be formed
a precipitate of SrSO4 will be formed
2) Combustion of 1.2 g of butane causes the reaction container volume to expand from 0.30 m3 to 0.50 m3 against an atmospheric pressure of 1.01 atm. Calculate the work associated with this reaction.
3)A 15.00 mL solution of Fe2+ (aq) is titrated with 0.150 M Cr2O72-(aq). If 6.50 mL was used up at the end point, what is the concentration of Fe2+ in the solution ?
6 Fe2+(aq) + 14 H+(aq) + Cr2O72-(aq) 2 Cr3+(aq) + 7 H2O (l) + 6 Fe3+(aq)
Explanation / Answer
1)
SrCl2 (aq) + K2SO4 (aq) ---------------> SrSO4 (s) + 2 KCl (aq)
a precipitate of SrSO4 (s) is formed
2)
moles of butane = 1.2 / 58.12 = 0.0206 mol
work = - nRT ln v2 / v1
= - p v ln v2 / v1
= - 1.01 x 0.3 x ln 0.5 / 0.3
= - 0.155 L.atm
work = - 15.68 J
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