Stoichiometry (Unit Conversions) Review

BALANCED chemical equations tell you the relative amounts or the ratios of reactants and products. 

Use the following BALANCED chemical equation to determine the ratio:
$$2HgO\ \rightarrow\ 2Hg\ +\ O_2$$   
What is the ratio of HgO to Hg

BALANCED chemical equations tell you the relative amounts or the ratios of reactants and products. 

Use the following BALANCED chemical equation to determine the ratio:
$$4NH_3+6NO\ \rightarrow\ 5N_2+6H_2O$$   
What is the ratio of  $$NH_3$$   to  $$NO$$  

When setting up a problem using mole ratios, remember to use dimensional analysis. Start with the given. The unit that the given has needs to be on bottom in the next frame so it will cancel out. Make sure to label with both unit and chemical formula.

Using the following BALANCED chemical equation.... $$
2HgO\rightarrow2Hg\ +\ O_2
If I decompose 34 moles of HgO, how many moles of oxygen will I produce?  What will the ratio that you use look like in this problem?  

$$\frac{34\ moles\ HgO}{ }\times\frac{\ \ \ \ \ ?\ \ \ \ }{?}$$  
 

When setting up a problem using mole ratios, remember to use dimensional analysis. Start with the given. The unit that the given has needs to be on bottom in the next frame so it will cancel out. Make sure to label with both unit and chemical formula.

Using the following BALANCED chemical equation.... $$
2HgO\rightarrow2Hg\ +\ O_2 $$4NH_3+6NO\rightarrow5N_2+6H_2O$$  
Bacteria will cause ammonia  $$NH_3$$  to react with NO to put nitrogen back in the air, along with water, as part of the nitrogen cycle.   If there are 3.56 moles of NO in the soil, how many moles of ammonia are needed to react with it?  

$$\frac{3.56\ moles\ NO}{ }\times\frac{\ \ \ \ \ ?\ \ \ \ }{?}$$  
 

Calculate the number of moles of water molecules in 36 g of water.

(M_r: H₂O = 18)

(Higher Tier Question)

How many moles is 50g of CaCO₃?

(a)