If 194g of ZnS is heated in the presence of 256g O2 to produce SO2. What is the limiting reactant? ZnS+2O2 2ZnO+SO2

ZnS is the limiting reactant.

Explanation:

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In this case, given the chemical reaction:

Whereas there is a 2:2 and 3:2 mole ratios of the reactants to the SO2 product respectively. In such a way, we need to compute the moles of SO2 product that are yielded by each reaction as shown below:

Thus, since zinc sulfide produces the fewest moles of SO2, we infer it is the limiting reactant.

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"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."