Worksheet: Atom Economy in Yield Calculations

In this worksheet, we will practice calculating the atom economy of a reaction from the chemical equation and using this value in yield calculations.

Q1:

Sodium nitrate was thermally decomposed to produce 59.2 g of sodium nitrite.

Calculate the number of moles of oxygen produced.

Calculate the atom economy of this reaction if sodium nitrite is the desired product.

Q2:

Copper(II) carbonate was thermally decomposed to produce 1.500 kg of copper(II) oxide.

Calculate the number of moles of carbon dioxide produced.

Calculate the atom economy of this reaction if copper(II) oxide is the desired product.

Q3:

Metallic silver was produced by thermal decomposition of 1.252 g of silver(I) oxide.

Calculate to 3 significant figures the number of moles of oxygen produced.

Calculate to 2 significant figures the atom economy of this reaction if silver is the desired product.

Q4:

Thermal decomposition of barium peroxide (BaO)2 produced 2.500 kg of barium oxide.

Calculate the number of moles of oxygen produced to three significant figures.

Calculate the atom economy of this reaction, to two significant figures, if barium oxide is the desired product.

Q5:

Silver is formed by reacting 35.27 g potassium argentocyanide (KAg(CN))2 with excess zinc. Zinc(II) cyanide and potassium cyanide are the only by-products.

Calculate the number of molecules of zinc reacted to 4 significant figures.

  • A 3 . 2 4 9 × 1 0
  • B 5 . 3 3 7 × 1 0
  • C 6 . 1 3 9 × 1 0
  • D 1 . 8 0 9 × 1 0
  • E 9 . 8 4 5 × 1 0

Calculate the mass of potassium cyanide produced to 4 significant figures.

Calculate the atom economy for this method of silver production, to 2 significant figures.

Q6:

Silicon dioxide reacts with carbon at high temperature to produce 3.00 kg of silicon carbide (SiC) with carbon monoxide as the only by-product.

Calculate the number of molecules of carbon monoxide produced.

  • A 9 . 0 1 × 1 0
  • B 3 . 4 7 × 1 0
  • C 4 . 1 1 × 1 0
  • D 1 . 0 6 × 1 0
  • E 6 . 4 5 × 1 0

Calculate the mass of silicon dioxide reacted.

Calculate the atom economy for this method of silicon carbide production to 2 significant figures.

Q7:

Silver(I) oxide is reacted with excess sulfadiazine:

C C H C H C C N C S H H H H O O N H C N N C C H C H H

The reaction produces 15.3 g of silver(I) sulfadiazine, with water as the only by-product.

Calculate the number of molecules of sulfadiazine reacted.

  • A 8 . 5 4 × 1 0
  • B 3 . 6 8 × 1 0
  • C 2 . 7 7 × 1 0
  • D 1 . 5 2 × 1 0
  • E 2 . 5 8 × 1 0

Calculate the mass of silver(I) oxide reacted.

Calculate, to 2 significant figures, the atom economy for this method of silver(I) sulfadiazine production.

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