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Chem Y3 (2023) > Mole concept and stoiochemistry > Flashcards

Mole concept and stoiochemistry Flashcards

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1
Q

How to find AR given isotopes?

A

Take no on side and the percentage of that and add all of the isotopes together.

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2
Q

What is the Mr of a molecular substance?

A

It is the the avg mass of 1 molecule of the covalent substance relative to 1/12 the mass of carbon-12

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3
Q

How to find mr

A

Add molar masses and amt tgt

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4
Q

What is the formula mass

A

It is the avg mass of 1 molecule of an ionic substance relative to 1/12 of the mass of carbon-12

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5
Q

How to find percentage mass?

A

(Ar of element/ mr of compound)x100%

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6
Q

What is the avogadro’s constant?

A

6.02x10^23

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7
Q

Units for molar mass

A

g/mol

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8
Q

No of moles

A

Mass/molar mass

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9
Q

No of moles of gas

A

Vol of gas (dm3)/24.0dm3

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10
Q

1dm3=?cm3

A

1000cm3 so u divide my 1000 to find dm3

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11
Q

Concentration in g/dm3

A

Mass (g)/ volume of solvent(dm3)

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12
Q

Concentration in mol/dm3

A

No.of moles/ vol of solvent (dm3)

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13
Q

Concentration in mol/dm3

A

concentration in g/dm3/ molar mass (g/mol)

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14
Q

No of moles using concentration

A

Concentration (mol/dm3)xvol(dm3)

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15
Q

Number of moles avogadro

A

No of particles/6.02x10^23

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16
Q

No of particles

A

No of molesx6.02x10^23

17
Q

Vol of gas (dm3)

A

No of molesx24.0

18
Q

Molar mass

A

Mass/no.of moles

19
Q

Mass

A

No.of molesxmolar mass

20
Q

Mass in g/dm3

A

Concentration(g/mol)/volume (dm3)

21
Q

Volume dm3

A

Mass(g)/concentration (g/dm3)

22
Q

Vol dm3 (mol)

A

No of moles (mol)/ concentration(mol/dm3)

23
Q

How to find empirical formula

A
  1. Find mass in 100g sample if percentage
  2. Find no. Of moles (mass/molar mass)
  3. Find ratio (divide by smalles no of moles)
  4. Find simplest whole no ratio (round to neares 1 dp)
24
Q

How to find n?

A

Mr of molecular formula/ mr of empirical formula

25
Q

What is the format for answering limiting reactant qns

A

_______ mol/dm3/cm3 of ______ shld react w ________ mol/dm3/cm3 ______. However ______ mol/dm3/cm3 of _______ is present. ________ is in excess. ________ is the limiting reactant

26
Q

Mole ratio is equal to ? Ratio

A

Volume ratio

27
Q

Percentage yield

A

Actual yield (lower Val)/ theoretical yield (higher Val) x100%

28
Q

Percentage yield steps given mass of 1 reactant and final mass

A
  1. Find no of moles of 1 reactant
  2. Compare to ratio of final mixture and find no of moles of final mixture
  3. Find theoretical mass of final mixture
  4. Put in formula
29
Q

Percentage purity

A

Mass of pure substance (lower Val)/ mass of substance used in reaction (higher Val) x 100%

Chem Y3 (2023) (2 decks)

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