Amount of substance Flashcards

1
Q

What is avogadro constant ?

A

The Avogadro constant as the number of particles in a mole.1 mole of any substance contains 6.02x10^23 particles (atoms, molecules, ions, electrons). Always contains the same number of particles.

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2
Q

What is concentration measured in ?

A

The concentration of a substance in solution, measured in mol dm^–3

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3
Q

What is Relative atomic mass ?

A

Average mass of an element compared to 1/12 of the average mass carbon 12

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4
Q

What is relative molecular mass ?

A

The average mass of a molecule of a compound compared to 1/12 of the average mass of an atom of carbon-12.

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5
Q

What is number of particles equation ?

A

n (number of moles) x avogadro constant

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6
Q

What is the moles equation ?

A

mass/mr

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7
Q

What is another moles equation ?

A

concentration x ( volume(dm^3) / 1000)

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8
Q

What is the ideal gas equation ?

A

Pv=nRt
pressure , volume , number of moles , ideal gas constant(8.31), temperature

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9
Q

What trends do gases and volatile liquids follow under standard conditions ?

A

pressure is proportional to temperature , volume is proportional to temperature and pressure and volume are inversely proportional.

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10
Q

What is empirical formula?

A

Smallest whole ratio of atoms in each element in a compound.

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11
Q

How to work out empirical formula ?

A

Step 1: Determine the masses. Step 2: Determine the number of moles by dividing the grams by the atomic mass. Step 3: Divide the number of moles of each element by the smallest number of moles. Step 4: Convert numbers to whole numbers.

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12
Q

What is molecular formula ?

A

Molecular formula is the actual number of atoms of each element in a compound.

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13
Q

How to work out molecular formula ?

A

Mr of the molecule / Mr of the empirical formula.

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14
Q

What is percentage atom economy ?

A

Economic, ethical and environmental advantages for society and for industry of developing chemical processes with a high atom economy.

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15
Q

What is percentage yield ?

A

% yield = experimental mass/theoretical mass x 100

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16
Q

What is percentage atom economy ?

A

%atom economy= mr of desired product/ mr of reactants x 100