Mixture of 1.80mol of hydrogen and 1.20 mol of gaseous chloride was sealed in a container. The mixture was left to reach equilibrium as..?

shown by the following equation H2 + Cl2 (double arrow) 2HCl At a given temperature the equilibrium mixture contained 2.15mol of hydrogen chloride. (1) Calculate the amount in moles, of hydrogen and of chlorine in the equilibrium mixture by using an ice table. I have in class notes, I can't see where the... show more shown by the following equation

H2 + Cl2 (double arrow) 2HCl
At a given temperature the equilibrium mixture contained 2.15mol of hydrogen chloride.

(1) Calculate the amount in moles, of hydrogen and of chlorine in the equilibrium mixture by using an ice table.

I have in class notes, I can't see where the -1.075 and the 0.725 comes from?
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