Final answer:
Without a chemical equation and mole ratios, precise calculation of the remaining limiting reactant isn't possible. If chlorine gas is the limiting reactant, all of it would likely be consumed in the reaction.
Step-by-step explanation:
When 5 grams of chlorine gas react with 7 grams of potassium bromide in a single displacement reaction, to find the amount of the limiting reactant remaining, we need to determine which reactant is the limiting one. In this case, chlorine gas is the limiting reactant. However, without the chemical equation and without knowing the mole ratios.
We cannot precisely calculate the amount remaining. Typically, we would use the molar masses of chlorine gas and potassium bromide to convert the masses to moles. Then apply the stoichiometry of the balanced chemical equation to find the amount that reacts and thus the remaining quantity of the limiting reactant.
Since we don't have the equation, we’ll have to make an educated guess based on the principles of stoichiometry that all of the chlorine gas would be consumed if it is indeed the limiting reactant, leaving none of the chlorine.