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Flashcards in Ch 9 Section 1 Deck (20):
1

composition stoichiometry deals with the mass relationships of

elements in compounds

2

reaction stoichiometry involves the mass relationships between

reactants and products in a chemical reaction

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reaction stoichiometry is based on chemical

equations and the law of conservation of mass

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all reaction stoichiometry calculations start with a

balanced chemical equation

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this balanced chemical equation gives the relative numbers of

moles of reactants and products

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reaction stoichiometry problems can be classified according to the information....and the information you are....

given in the problem; expected to find, the unknown

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given and unknown may both be

reactants, products, or one may be a reactant and the other a product

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masses are generally expressed in

grams

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stoichiometric problems are solved by using ratios from the balanced equation to

convert the given quantity by using methods described

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when amount in moles is given and you must find amount in moles of another substance general plan is:
amount of given substance (mol)→

amount of unknown substance (mol)

11

when given amount in moles and asked to calculate the mass of another substance, general plan is:
amount of given substance (mol)→

amount of unknown substance (mol)→mass of unknown substance (g)

12

when given mass of one substance and asked to calculate moles of another, general plan is:
mass of given substance (g)→

amount of given substance (mol)→amount of unknown substance(mol)

13

when you are given the mass of a substance and asked to calculate mass of another substance, general plan is:
mass of given substance (g)→

amount of given substance (mol)→ amount of unknown substance (mol)→mass of unknown substance (g)

14

solving any reaction stoichiometry problem requires the use of a mole ratio to convert from moles or grams of one substance to

moles or grams of another substance

15

a mole ratio is a conversion factor that relates the amounts in moles of any

two substances involved in a chemical reaction

16

the mole ratio is obtained directly from the

balanced chemical equation

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coefficients in a chemical equation satisfy the law of conservation of matter and represent the

relative amounts in moles of reactants and products

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mole ratios are exact, so they do not limit the

number of significant figures in a calculation

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molar mass is the conversion factor that relates the mass of a substance to the

amount in moles of that substane

20

to solve reaction stoichiometry problems, you will need to determine molar masses using

the periodic table