Worksheet: Atom Economy

In this worksheet, we will practice calculating the atom economy for reactions, using the relative formula masses of the reactants and desired products.

Q1:

Which of the following is the best definition for the atom economy of a reaction?

  • AThe mass of useful products as a percentage of the mass of reactants
  • BThe number of atoms in the useful products as a percentage of the number of atoms in the reactants
  • CThe percentage of atoms in the reactants that are converted to waste
  • DThe ratio of the number of atoms in the products to the number of atoms in the reactants
  • EThe percentage of atoms in the reactants derived from economical sources

Q2:

Which of the following reactions has the greatest atom economy for the production of hydrogen?

  • A
  • B
  • C
  • D
  • E

Q3:

What is the formula for calculating the atom economy of a reaction?

  • A A t o m e c o n o m y n u m b e r o f a t o m s i n t h e u s e f u l p r o d u c t n u m b e r o f a t o m s i n t h e r e a c t a n t s = × 1 0 0 %
  • B A t o m e c o n o m y s u m o f r e l a t i v e f o r m u l a m a s s e s o f t h e r e a c t a n t s s u m o f r e l a t i v e f o r m u l a m a s s e s o f t h e p r o d u c t s =
  • C A t o m e c o n o m y s u m o f t h e r e l a t i v e f o r m u l a m a s s e s o f t h e p r o d u c t s s u m o f r e l a t i v e f o r m u l a m a s s e s o f t h e r e a c t a n t s = × 1 0 0 %
  • D A t o m e c o n o m y n u m b e r o f a t o m s i n t h e r e a c t a n t s n u m b e r o f a t o m s i n t h e u s e f u l p r o d u c t =
  • E A t o m e c o n o m y r e l a t i v e f o r m u l a m a s s o f t h e u s e f u l p r o d u c t s u m o f r e l a t i v e f o r m u l a m a s s e s o f t h e r e a c t a n t s = × 1 0 0 %

Q4:

Shown in the table are the molar masses of calcium oxide, calcium carbonate and carbon dioxide.

Substance C a O C a C O 3 C O 2
Molar Mass (g/mol) 56 100 44

Calcium oxide can be made from calcium carbonate by heating, according to the equation:

To the nearest percentage unit, what is the atom economy for the production of calcium oxide via this process?

Q5:

Barium sulfate (BaSO)4 can be made by adding sodium sulfate (NaSO)24 to a solution of barium chloride (BaCl)2, as illustrated by the equation:

To the nearest percentage unit, what is the atom economy for the production of barium sulfate via this process?

Q6:

Calcium metal can be used to produce pure rubidium from its chloride according to the equation:

What is the atom economy for the production of rubidium by this process, to the nearest percentage unit?

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