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Chem > Amount Of Substance > Flashcards

Amount Of Substance Flashcards

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1
Q

What is Ar?

A

The mean mass fo an element, divided by 1/12 of the mass of an atom of the C12 isotope

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2
Q

What is Mr?

A

The mean mass of a compound, divided by 1/12 of the mean mass of an atom of the C12 isotope

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3
Q

What is the Avogadro Constant (L)?

A

L = 6.022 X 10^23

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4
Q

How do we find the number of particles using the Avogadro constant?

A

Number of particles = nL (n=moles)

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5
Q

Moles equation 1

A

Mass = Moles x Mr

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6
Q

Moles equation 2

A

Moles = conc X vol/1000

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7
Q

When under standard conditions, what trends do gases and volatile liquids follow?

A
  • pressure is proportional to temperature
  • volume is proportional to temperature
  • pressure and volume are inversely proportional
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8
Q

What is the ideal gas equation?

A

pV = nRT = mRT/Mr

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9
Q

What are the units?

A

p = pressure (Pascals)
V = volume (m^3)
T = temp (Kelvin)
n = moles
m = mass (grams)
R = ideal gas constant

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10
Q

What is the ideal gas constant?

A

8.31JK^-1mol^-1

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11
Q

What is empirical formula?

A

The simplest whole number ratio of atoms in each element of a compound

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12
Q

Calculating the true num of atoms in the molecule using empirical formula.

A

Mr/empirical Mr = multiplier

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13
Q

How do we calculate the empirical formula?

A
  • divide each mass or percentage by Ar to find moles
  • calculate the ratio by dividing all moles by the smallest number of moles.
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14
Q

What is percentage yield?

A

Shows how much product is obtained compared to maximum possible mass

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15
Q

Percentage yield equation

A

% yield =experimental mass / theoretical mass X 100

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16
Q

Atom economy equation

A

% atom economy = Mr of desired product / Mr of reactants X 100

17
Q

Why is it good to have a high atom economy for a reaction?

A
  • little to no waste product
  • so more economically viable for industrial scale manufacture
  • beneficial for environment as it uses less natural resources, so less energy

Chem (1 decks)

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