What is the atom economy of a reaction?
The number of atoms that do not end up as useful products
A measure of the amount of starting materials that end up as useful products
The actual yield compared to the maximum theoretical yield
How is percentage yield calculated?
Mass of product actually made, divided by the maximum theoretical mass of product, all multiplied by 100%
Maximum theoretical mass of product, divided by the mass of product actually made, all multiplied by 100%
Mr of desired product from equation divided by sum of Mr of all reactants from equation, all multiplied by 100%
What is the atom economy for the product of calcium oxide in the equation below?
CaCO3 → CaO + CO2
(Ar of Ca = 40, Ar of C = 12, Ar of O = 16)
44%
56%
82%
In an experiment, 1.3 g of sodium chloride is made. The maximum theoretical mass of sodium chloride is 1.6 g. What is the percentage yield?
81%
45%
30%
What is the atom economy for the production of iron in the equation below?
Fe2O3 + 3C → 2Fe + 3CO
(Ar of Fe = 56, Ar of C = 12, Ar of O = 16)
75%
67%
57%
In an experiment, 0.6 g of copper chloride is made. The maximum theoretical mass of copper chloride is 0.7 g. What is the percentage yield?
14%
46%
86%
What is the mass of 12 dm3 of oxygen gas, O2? - Higher
Ar of oxygen = 16 and 1 mol of gas occupies 24 dm3 at room temperature and pressure.
8 g
16 g
32 g
In the equation below, what volume of oxygen gas reacts with 50 cm3 of propane (C3H7)? - Higher
C3H8 + 5O2 → 3CO2 + 4H2O
50 cm3
100 cm3
250 cm3
What is the volume of 6 mol of nitrogen gas? - Higher
1 mol of gas occupies 24 dm3 at room temperature and pressure.
144 dm3
6 dm3
4 dm3
What amount in mol of argon occupies 3 dm3 at room temperature and pressure? - Higher
8 mol
21 mol
0.13 mol