Final Answer:
The given statement, in the chemical equation FeS + 2HCI -> FeCI2 + H2S there is one FeS molecule is False.
Step-by-step explanation:
The chemical equation provided, FeS + 2HCl -> FeCl2 + H2S, represents a reaction between one molecule of iron sulfide (FeS) and two molecules of hydrochloric acid (2HCl) producing one molecule of ferrous chloride (FeCl2) and one molecule of hydrogen sulfide (H2S). To determine the number of FeS molecules involved, you need to consider the stoichiometry of the balanced equation. According to the equation, the coefficient in front of FeS is 1, indicating one molecule of FeS takes part in the reaction. However, the number of molecules isn't the only factor to consider; it's also important to consider the ratio of moles involved in the reaction, which in this case is one mole of FeS.
In chemical equations, coefficients represent the relative number of moles of each reactant and product involved in the reaction. The coefficient of FeS in this equation is 1, indicating one mole of FeS reacts with two moles of HCl to produce one mole of FeCl2 and one mole of H2S. Therefore, despite the equation only explicitly stating one molecule of FeS, it corresponds to one mole of FeS in the reaction. This is a common representation in balanced chemical equations, where coefficients indicate mole ratios rather than specific molecule counts. Thus, the statement "there is one FeS molecule" is false in the context of this chemical equation, as it involves the reaction of one mole of FeS.