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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if you're asking what comes out, it's steam.

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.