I need help with quantative chemistry questions?

Jason

New member
I didn't really understand the concept so it would be better if you answer with processes

1. consider the reaction: 2 Al(s)+3 I2(s) --> 2 AlI3(s)

Determine the limiting reagent and the theoretical yield of the product form:

a) 1.20 mol aluminium and 2.40 mol iodine.
b) 1.20g aluminium and 2.40g iodine.
c) Calculate how many grams of aluminium are left over in part b.

2. Freon-12 (used as coolant in refrigerators), is formed as follows:
3 CCl4(l) + 2 SbF3(s) --> 3 CCl2F2(g) + 2 SbCl3(s)

150g tetrachlormethane is combined with 100g antimony(III) fluoride to give freon-12 (CCl2F2).

a) Identify the lmiting and excess reagents.
b) Calculate how many grams of Freon-12 can be formed.
c) How much of the excess reagent is left over?

3. Aspirin made by adding acetic anhydride to an aqueous solution of salicylic acid. The equation for the reaction is:

2 C7H6O3 (aq) + C4H6O3 (l) --> 2 C9H8O4 (aq) + H2O (l)
(Salicylic acid + acetic anhydride --> aspirin + water)

If 1.00 kg of salicylic acid is used with 2.00 kg of acetic anhydride, determine:

a) the limiting reagent.
b) the theoretical yield.
c) If 1.12 kg aspirin is produced experimentally, determine the percentage yield.
 
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