Unit 4: Molar Quantities Flashcards

1
Q

Mole

A

a unit of chemical quantity used to express a number of ions

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2
Q

First mole formula

A

=n/A

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3
Q

Avogrados number

A

number of particles in a mole
6.022 x 10^23

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4
Q

Converting between mass and moles

A

n=m/M

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5
Q

percent compostion

A

% = (part/whole) x 100

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6
Q

Emperical formula

A

molar ratio between elements which give us the subscripts for the emperical formula (reduced ratio of the chemical formula)

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7
Q

proust’s law of definite proportions

A

a given chemical compound always contains its component elements in a fixed ratio, regardless of source of method or preparation

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8
Q

Molecular formula

A

the actual number of atoms in one molecule of a compound

F = Mr/Memp

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9
Q

Percentage error

A

a way for scientists to express how far off a lab result is form the commonly accepted value

% error = l (accepeted value - experimental value) /accepted value l x100

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10
Q

Stoichiometry

A

used to determine chemical quantities in a reaction by using molar ratios

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