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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 />
a)If listing each molecule it will be seen that on the on<br />
b. Zn(s)+Au + (aq) →Zn 2+ (aq) +Ag(s) the right there are 2 oxygens while the left has only 1<br />
b)The equation is not changes, it is the same on both<br />
product and rectant<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 />
2Al + 6HCl ---> 3H 2 + AlCl 3<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 />
10.1m 1m<br />
5m<br />
200mL<br />
1000mL<br />
=<br />
2020<br />
5000<br />
=.404mL<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)<br />
.502gCH 4<br />
1mCH 4<br />
1mCO 2<br />
44gCO 2<br />
1.38<br />
16gCH 4<br />
1mCH 4<br />
1mCO 2<br />
Limiting reagent is O 2 with product of .37g<br />
.27gO 2<br />
32gO 2<br />
1mO 2<br />
1mO 2<br />
1mCO 2<br />
1mCO 2<br />
44gCO 2<br />
.37125<br />
Pg102
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