Unit 3-Quantites in Chemistry

Question 1

calculate molar mass

Answer 1

grams per mole

from the periodic table

Question 2

law of definite proportions

steps

Answer 2

percent composition to mass to move to mole ratio to WNR to simplest formula

Question 3

calculate the number of entities from mass

Answer 3

use the relationship

6.02x10^23 over 1 mol

Question 4

molecular formula determination

Answer 4

take the simplest formula and find the grams per mole. divide the mass of the molecular formula by the mass of the simplest formula and multiply by the simplest formula to get the molecular formula

Question 5

stoichiometry

Answer 5

using the mole concept and balanced chemical equation to solve problems

Question 6

mass – mass problems

Answer 6

given the grams of one substance to find the grams of another substance using a balanced chemical equation

Question 7

percentage yield

Answer 7

actual yield divided by theoretical yield multiplied by 100

Question 8

actual yield

Answer 8

The amount measured in an experiment

Question 9

theoretical yield

Answer 9

from stoichiometric calculations

Question 10

why does something have a greater than 100% yield?

Answer 10

air could react with reagents

Question 11

what would cause a yield less than 100?

Answer 11

spattering, impurities of reagents, loss through transfer, unideal conditions

Question 12

limiting reagent problems

steps

Answer 12

1. underlined the given and asked to find
2. balance the chemical equation
3. determine the moles of the given from the mass
4. which is the limiting reactants? She was one given and multiply by the mall relationship from equation if the number is less that then not given is limited is more the other is limited
   Continue steps with limited reactant!!!!
5. determine the number of moles of asked to find
6. determine the mass of asked to find
7. therefore statement

Question 13

balancing equations

Answer 13

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