Extent of reaction

What is the unit of the extent of reaction?

• Joule

• Watt

• Mole

• Gram

At t=0, what is the value of ξ?

• 1

• 0

• Infinity

Is this equation well balanced?

2Fe + 2Cl₂ = 2FeCl₃

• True 

• False

Answer explanation

There are 4 Cl elements in the reactants and 6 in the products. It should be 3 Cl₂

Fill in the ? 

• n(Fe)- ξ

• n(Cl₂)- 2 ξ

• 2 ξ

• n(Fe)- 2ξ

Answer explanation

At the initial state the quantity of Fe is n(Fe). The stoechiometric number of Fe is 2 so when the reaction starts the quantity of Fe equals the initial quantity minus 2 times the extent of reaction

Fill in the ?

• n(Cl₂) - 2ξ

• n(Cl₂) - 3ξ

• 3ξ

• 2ξ

Answer explanation

There is n(Cl₂) quantity at the beginning. When the reaction starts then because the stoechiometric number is 3 the quantity will evolve to n(Cl₂)-3ξ

Fill in the ?

•  ξ

• n(FeCl₃) - 2 ξ

• 2 ξ

• 0

Answer explanation

The initial quantity is 0. The stoechiometric number is 2 so when the reaction starts the quantity equals 2 ξ