Chemistry Mole Ratio Science subject for shs

science

1. JV S. VALLE
Subject Teacher

2. MOLE RATIOS &
STOICHIOMETRY

3. We have learned that the coefficients in a chemical equation
indicate the relationships between moles of reactants and
products. We can use this relationships between coefficients to
derive conversion factors called mole ratios. A mole ratio is a ratio
between the number of moles of any two of the substances in a
balanced chemical equation.
Mole Ratio

4. Example: Potassium (K) reacts with bromine (Br2) to form potassium bromide. In the
product, the salt potassium bromide is prescribed by the veterinarians as an antiepileptic
medication for dogs and cats.
MOLE RATIO
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There are at least 6 mole ratios extracted from the given sample and these are:

5. SIMPLIFIED
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There are at least 6 mole ratios extracted from the given sample and these are:

6. Example: Determine all possible mole ratios for the following balanced chemical equation.
TRY THIS
4��+ ��
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There are at least 6 mole ratios extracted from the given sample and these are:

7. How many moles of ammonia are produced if 4.20 moles of hydrogen are
reacted with an excess of nitrogen.
SAMPLE PROBLEM
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�→��??????
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1 �??????� ??????� ??????
2
3 �??????� ??????� ??????
2
,
3 �??????� ??????� ??????
2
1 �??????� ??????� ??????
2
,
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2
2 �??????� ??????� ????????????
3
,
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1 �??????� ??????� ??????
2
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2
2 �??????� ??????� ????????????
3
,
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Given: 4.2 mole of hydrogen (H)
Amonia (NH3): ???
4.2 �??????���??????�??????
2
1
??????
2 �??????��� ??????� ????????????
3
3 �??????���??????�??????
2
=
8.4
3
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3=�.� �??????��� ??????� �??????
�

8. How many moles of ammonia are produced if 300g of hydrogen are reacted
with an excess of nitrogen.
SAMPLE PROBLEM
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1 �??????� ??????� ??????
2
3 �??????� ??????� ??????
2
,
3 �??????� ??????� ??????
2
1 �??????� ??????� ??????
2
,
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2
2 �??????� ??????� ????????????
3
,
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3
1 �??????� ??????� ??????
2
,
3 �??????� ??????� ??????
2
2 �??????� ??????� ????????????
3
,
2 �??????� ??????� ????????????
3
3 �??????� ??????� ??????
2
Given: 300g of hydrogen (H2)
Amonia (NH3): ???
148.5149 �??????���??????�??????
2
1
??????
2 �??????��� ??????� ????????????
3
3 �??????���??????�??????
2
=
297.0298
3
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3=��.���� �??????��� ??????� �??????
�
300 �??????�??????
2
1
??????
1 �??????��� ??????� ??????
2
2.02 �??????�??????
2
=
300
2.02
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2=���.���� �??????��� ??????� ??????
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H2 = 2.02g

9. Determine the mass of sodium chloride (NaCl), commonly called table salt,
produced when 1.25 mol of chlorine gas (Cl2) reacts vigorously with excess sodium. The
balanced equation is given for you.
TRY TO SOLVE
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�→��??????��

10. Hydrogen sulfide gas burns in oxygen to produce sulfur dioxide and water vapor. What
mass of oxygen gas is consumed in a reaction that produces 4.60 mol SO2?
TRY TO SOLVE
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