The Islamic University of Gaza
Chemistry Department
Chemical Engineering (CHEM 1301)
Time: 1 hour
‫الرقم‬
:‫الشعبة‬
30
........................................ ................. :‫الجامعي‬
......................................................................... :‫االسم‬
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............................................................ .:‫المدرس‬
Q1- Choose the correct answer:
1- Which is the formula for copper(I) phosphate?
a) Cu3PO4
b) Cu2(PO4)3
c) Cu(PO4)2
2- Which one of the following is named correctly?
a) Ca(HS)2, calcium sulfide
c) AlN, aluminum nitride
b) HBrO2, bromic acid
d) FeO, iron(III) oxide
3- Which statement is false for the balanced equation given below?
(Atomic weights: N = 14.0, H = 1.00, O = 16.00).
4NH3 + 5 O2  4 NO + 6 H2O
a) The reaction of 4 molecules of NH3 requires 5 molecules O2.
b) The reaction of one mole of NH3 requires 40 g of O2.
c) The reaction of 4 moles of NH3 produces 30 g of NO.
d) The reaction of 10 molecules of NH3 produces 15 molecules of H2O.
4- Which of the following compounds contains the largest mass of carbon atoms?
(At. Wt.: C = 12.01, O = 16.00, H = 1.008).
a) 0.10 mole C6H12O6
c) 0.07 mole C8H18
b) 0.25 mole C2H6
d) 0.50 mole CH4
5- Which combination will produce a precipitate?
a) NH4OH (aq) and HCl (aq)
b) AgNO3 (aq) and Ca(C2H3O2)2 (aq)
c) NaCl (aq) and HC2H3O2 (aq)
d) NaOH (aq) and Fe(NO3)2 (aq)
6- Write the net ionic reaction for the neutralization of HF(aq) by NaOH(aq).
a) H+(aq) + OH−(aq)  H2O(l)
b) HF(aq) + NaOH(aq)  NaF(aq) + H2O(l)
c) HF(aq) + NaOH(aq)  Na+(aq) + F−(aq) + H2O(l)
d) HF(aq) + OH−(aq)  F−(aq) + H2O(l)
7- Which of the following reactions is an oxidation reduction reaction?
a) 2Fe(s) + 6HCl(aq) → 2FeCl3(aq) +3 H2 (g)
c) Pb2+(aq) + 2Cl- (aq) → PbCl2(s)
b) Pb2+(aq) + S2-(aq) → PbS(s)
d) HCl(aq) + NH3(aq) →NH4Cl(aq)
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d) Cu(PO3)2
‫اسم‬
8- For which one of the following reactions does the enthalpy change represent a standard enthalpy of formation?
a) N2 (g) + 3H2 (g) → 2NH3 (g)
b) 1/2N2 (g) + O2 (g) → NO2 (g)
c) 6C (s) + 6H (g) → C6H6 (l)
d) 12C (g) + 11H2 (g) + 11O (g) → C12H22O11 (g)
9- The reaction of cyanamide NH2CN(s), with oxygen was run in a bomb calorimeter, and ∆E was found to be
−742.7 kJ/mol of NH2CN(s) at 298 K. Calculate ∆Hºrxn (in kJ) at 298 K for the reaction:
NH2CN(s) + 3/2 O2 (g) → N2 (g) + CO2 (g) + H2O (l)
a) −741.5
c) −743.9
b) 741.5
10- Consider the following reaction:
2 CH3OH(g)
(Given that: R = 8.314 J/mol.K)
 2 CH4(g) + O2(g)
d) 743.9
ΔH = + 252.8 kJ
How many kilojoules of heat are released when 48 g of CH4(g) (M.Wt = 16) reacts completely with
O2(g) to form CH3OH(g) at constant pressure?
a) −379.2 kJ
b) 379.2 kJ
c) 168.5 kJ
d) − 168.5 kJ
Q2- Answer the following questions:
1- The combustion of a 0.1000 g sample of a compound containing carbon, hydrogen and oxygen produced 0.1910
g CO2 (M. Wt. = 44) and 0.1172 g H2O (M. Wt. = 18). What is the empirical formula for the compound?
C2H6O
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2- Calculate the concentration of each ion present in the solution formed by mixing 3.60 g KCl (F.Wt. = 74.55) in
75.0 mL of 0.250 M CaCl2 solution.
1.144 M Cl-, 0.644 M k+, 0.250 M Ca2+
3- What is the mass of the precipitate formed when 12.0 mL of 0.150 M NaCl is added to 25.00 mL of
a 0.0500 M AgNO3 solution? (At. Wt.: Cl = 35.45, O = 16, N = 14, Ag = 107.87, Na = 23)
0.179 g
4- Ethylene (C2H4) (M. Wt. = 28) can be prepared by heating hexan (C6H14) (M. Wt. = 86) according to the
following reaction?
C6H14  C2H4 + other products
If the yield of ethylene is 42.5%, what is the mass of hexane must react to produce 481 g of ethylene?
3.48  103 g
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5- Given the experimental information below:
2 Sr(s) + O2(g)  2 SrO(s)
SrCO3(s)  CO2(g) + SrO(s)
2 O2(g) + 2 C(graphite)  2 CO2(g)
ΔH = ─ 1180 kJ
ΔH = + 234 kJ
ΔH = ─ 788 kJ
Determine ΔH for the reaction:
Sr(s) + 3/2O2(g) + C(graphite)  SrCO3(s)
− 1218 kJ/mol
6- Consider the following reaction:
2 CH3OH(l) + 3O2(g)  2 CO2(g) + 4H2O(l)
ΔH = ─ 1453 kJ
a) Calculate the heat produced by combustion per liter of methanol (M. Wt = 32). Methanol has a density
of 0.791 g/ml.
d) Calculate the mass of CO2 produced per kJ of heat emitted.
a) ─ 1.7958 X 104 kJ/ L
b) 0.0606 g CO2 / kJ
 Good Luck 
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