1. a) Write the balanced equation for the combustion of propane, C3Ha. b) How ma
ID: 1047179 • Letter: 1
Question
1. a) Write the balanced equation for the combustion of propane, C3Ha. b) How many grams of water are produced when 60.0 grams of propane are burned? c) How many moles of oxygen are needed for complete combustion for 60.0 grams of propane? 2. Write balanced chemical equations for the dissolution/dissociation of the following compounds in water. Include states. a) (NH )2S04(s) b) CH1206(s) H20 H20 H20 3. Determine the concentration of each i in the solutions: I(NHa)250.]-2.00M IN1- so.] NH41 SO41 [KaPOa] 1.50 M [PO431 4. Calculate the mass of KI in grams required to prepare 500 mL of a 2.80 M KI solution.Explanation / Answer
1.A. C3H8 + 5 O2 - - - - - - > 3 CO2 + 4 H2O
B. 44 g propane produced 5x 18 g water
60 g propane produce X g water
X= 60x5x18/44= 122.7 g water
C. For 44 g propane needs 5 mole O2
60 g propane needs X mole O2
X = 60x 5/44= 6.81 mol O2
2. (NH4)2SO4 (s) +H2O - - - - - - > 2 NH4OH(s) + H2SO4 (l)
K3PO4 (s) + 3 H2O - - - - - - - > 3 KOH (s) + H3PO4 (l)
3.. [NH4+] = 2X 2= 4 M, [SO42-] =2M,Since ammonium sulfate exists as 2 NH4+& SO42-
[K+] = 3x 1.5= 4.5 M, and [PO43-] = 1.5M since potassium phosphate exists as 3 K+ & PO43-
4. MASS = Molarity x molar mass xvolume /1000
W= 2.8x166x500/1000= 232.4 g
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