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Stoichiometry and balanced equations make it possible to use one piece of information to calculate<br />
another. There are countless ways stoichiometry can be used in chemistry and everyday life. Try and<br />
see if you can use what you learned to solve the following problems.<br />
Problem 1<br />
Why are the following equations not considered balanced?<br />
a. H2O(l)→H2(g)+O2(g)<br />
b. Zn(s)+Au + (aq) →Zn 2+ (aq) +Ag(s)<br />
Problem 2<br />
Hydrochloric acid reacts with a solid chunk of aluminum to produce hydrogen gas and aluminum ions.<br />
Write the balanced chemical equation for this reaction.<br />
___HCl 2 + ___Ag = ___H + ___Cl 2 + ___Ag<br />
2<br />
There is one oxygen in the reactants, and two in the product<br />
( )<br />
In the reactants there is a gold atom, and in the product there it is replaced with a silver atom.<br />
Problem 3<br />
Given a 10.1M stock solution, how many mL must be added to water to produce 200 mL of 5M<br />
solution?<br />
Problem 4<br />
If 0.502g of methane gas react with 0.27g of oxygen to produce carbon dioxide and water, what is the<br />
limiting reagent and how many moles of water are produced? The unbalanced equation is provided<br />
below.<br />
CH4(g)+O2(g)→CO2(g)+H2O(l)
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