Calculate the amount of carbon dioxide that could be produced when 1 mole of carbon is burnt in air.

The correct option is 1 mole.

To understand why this is correct, we can look at the chemical reaction for the combustion of carbon in air (oxygen):

$$\text{C}(\text{s})+{\text{O}}_2(\text{g})\to {\text{CO}}_2(\text{g})$$

Let us analyze the stoichiometry of this balanced chemical equation:
1. 1 mole of carbon atoms ($\text{C}$) reacts completely with 1 mole of oxygen molecules (${\text{O}}_2$).
2. This reaction yields exactly 1 mole of carbon dioxide gas (${\text{CO}}_2$).

Since carbon is burnt in air, oxygen is present in excess. Therefore, carbon acts as the limiting reactant. According to the 1:1 molar relationship between carbon and carbon dioxide in the balanced equation, burning 1 mole of carbon will produce exactly 1 mole of carbon dioxide.