
Molar Mass and Stoichiometry Introduction
Presentation
•
Chemistry
•
9th - 12th Grade
•
Hard
Joseph Anderson
FREE Resource
5 Slides • 13 Questions
1
Stoichiometry Review
2
How to find Molar Mass of a substance
Molar Mass is the mass in grams of one mole of a substance.
Find the atomic mass of each element from the Periodic table.
(ex: C6H12O6 has C, H and O)
Multiply the mass of each element by the number of atoms in that compound. (ex: 12.01 x 6 = 72.06 g/mol)
Add the molar masses of each element in the compound together.
(ex: C6H12O6, 72.06 + 12.08 + 95.99 = 180.14 g /mol)
3
Multiple Choice
What is the molar mass of fluorine gas?
4
How to use Molar Mass to convert to Moles
Molar Mass is the mass in grams of one mole of a substance.
Find the molar mass of a substance.
(ex: 1 mole of HCl = 36.46 g of HCl)
If we are given an amount, we compare to our molar mass.
(ex: 9 g of HCl is used. 9 g / 36 g = 0.25 mol of HCl.)
5
Multiple Choice
Find the mass of 5.82 mol of MgCl2. Round to the nearest tenth.
552.9 g
436.8 g
55.2 g
555.9 g
6
Multiple Choice
Find the mass of 3.8 mol of H2O. Round to the nearest tenth.
57.9 g
54.8 g
68.4 g
62.3 g
7
Multiple Choice
Determine the number of moles of AlNO3 that are in 264 g of the compound.
2.97 mol
3.45 mol
2.73 mol
1.86 mol
8
What is stoichiometry?
What is it?
A method to calculate the amount of reactants needed for a reaction.
-or-
A method to calculate the amount of products that can be made from a reaction.
Some text here about the topic of discussion
9
Steps in Stoichiometry
You will need to:
Balance the chemical equation.
Write the information from the question above the chemical equation.
Write the number of moles (coefficients) below the equation.
Set up your proportion.
Cross-multiply and solve for x.
10
Draw
Balance this equation. Show your work and complete answer.
11
Draw
If 5 grams of H20 were produced in this reaction, how many grams of C3H8 were combusted? Show your work.
12
Multiple Choice
13
Multiple Choice
What coefficient goes in front of H2?
14
Multiple Choice
What is the first thing you must do to solve a stoichiometry problem?
Make sure the chemical reaction is Balanced
Panic
Make sure the Equation is Unbalanced
Multiple by Avogadro's Number
15
Multiple Choice
How many moles of H2 are needed to react with 2 moles of N2 according to the reaction?
1 N2 + 3 H2 → 2 NH3
6
2
3
1
16
Multiple Choice
If 12.00 moles of NaClO3 react, how many moles of O2 will be produced according to the reaction?
2 NaClO3 → 2 NaCl + 3 O2
12 moles of O2
18 moles of O2
9 moles of O2
6 moles of O2
17
Multiple Choice
1 Cl2 + 2 KBr → 1 Br2 + 2 KCl
How many GRAMS of KCl can be produced from 356 g of KBr?
749 g
223 g
479 g
814 g
18
Multiple Choice
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from 6 moles H2?
Stoichiometry Review
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