QUESTION 1
How many waffles can be made from 1 dozen eggs, assuming you have enough of all other ingredients?
Given: 2 cups flour + 3 eggs + 1 tbsp oil ------> 4 waffles
16
20
24
12
QUESTION 2
How many grams of water is produced by reacting 45 g of hydrogen gas?
2H2 + O2 --------> 2H2O
450 g
4.0 x 10^2 g
230 g
2.3 x 10^3 g
QUESTION 3
How many moles of A are needed to produce 4.5 moles of A2O in the following reaction?
4A + O2 --------> 2A2O
9.0 moles
4.5 moles
2.6 moles
18 moles
QUESTION 4
In the synthesis of NH3, how many moles of NH3 will be produced by using 3.0 moles of N2 and 6.0 moles of H2?
4.0 moles NH3, and N2 is the excess reagent
3.0 moles NH3, and N2 is the excess reagent
4.0 moles NH3, and H2 is the excess reagent
2.0 moles NH3, and H2 is the limiting reagent
QUESTION 5
Consider the following reaction
A2 + 2B ---------> A2B2 ΔH° = -20 kJ
100 kJ of energy is produced in the reaction, how many moles of A2 were used?
5 moles
2 moles
7 moles
4 moles
QUESTION 6
What is the theoretical yield of water by reacting 15 g of oxygen gas in the following reaction?
2H2 + O2 --------> 2H2O
17 g
46 g
3.1 g
62 g
QUESTION 7
Given that
4 NH3 + 5 O2 -----> 4NO + 6H2O
when 4.5 moles of H2O are formed, the amount of moles of NO formed is
3.0
1.5
4.5
6.0
QUESTION 8
The ΔH° for the reaction is
Al(s) + 3/2 H2(g) + 3/2 O2(g) ---------> Al(OH)3(s)
we cannot determine the sign of delta H
it is + because the reaction is endothermic
it is negative because the reaction is exothermic
it is + because the reaction is endothermic
QUESTION 9
How many grams of water will be produced using 4.5 g of CH4 in the complete combustion of CH4?
10 g
10. g
5.06 g
5.1 g
QUESTION 10
Consider the evaporation of water in the following reaction;
H2O(l) ----------> H2O(g) ΔH = +44 kJ
a. Is this reaction endothermic or exothermic?
b. How much heat is needed for evaporating 45 g of water?
Endo & 1900 kJ
Endo & 110 kJ
Exo & 650 kJ
Exo & 110 kJ