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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) Because on the reactant side, there is only one oxygen, while the product as two.<br />
b. Zn(s)+Au + (aq) →Zn 2+ (aq) +Ag(s) There are two different elements. One is gold and one silver.<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 />
6HCl + 2Al --> 3H2 + 2AlCl3<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 />
10.1*(1/1000)*(5/1)*(1.10.1)*(1000/1)=5mL<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 />
1CH4 + 2O2 --> 1CO2 + 2H2O<br />
C1<br />
C1<br />
H4<br />
H24<br />
O22<br />
O34<br />
CH4(g)+O2(g)→CO2(g)+H2O(l)<br />
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