Chapter 3 Flashcards

1
Q

What is Avogadro’s constant? (Given on data sheet)

A

The number of carbon -12 atoms that are in exactly 12g of carbon-12. It is 6.02 x 10²³

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2
Q

What is molar mass?

A

The mass of one mole of substance. It has units of gmol-¹

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3
Q

Define Relative isotopic mass

A

The mass of an atom of an isotope relative to 1/12 th of the mass of an atom of c-12

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4
Q

Define Relative atomic mass

A

The weighted means of mass of an atom of an element relative to 1/12th of an atom of C-12

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5
Q

Define Relative molecular mass

A

The mass of a molecule relative to 1/12th of the mass of an atom of C-12

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6
Q

Define Relative formula mass

A

The mass of a formula unit relative to 1/12th of the mass of an atom of C-12 (applies to giant structures)

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7
Q

Define Anhydrous

A

Containing no water molecules

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8
Q

Define hydrated

A

A crystalline (solid) compound containing water molecules

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9
Q

Define water of crystallisation

A

Water molecules that are bound into a crystalline structure of a compound

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10
Q

One mole of any gas occupies the same ____ at room temp and pressure

A

Volume

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11
Q

Name the formula for % atom economy

A

(mass desired product/mass all products) x100

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12
Q

Name the formula for Number of moles from mass

A

N= mass/ molar mass

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13
Q

Name the formula for finding the number of moles in solutions

A

N= concentration in mol dm-³ X volume in dm³

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14
Q

Name the gas formula

A

Pressure (Pa) x Volume(m3) = moles x Gas constant x temperature (k)

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15
Q

Name the gas formula at room pressure and temp

A

N = Volume (dm³) /24 or N= Volume (cm³)/ 24000

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16
Q

Name the Gas constant

A

8.314

17
Q

Conversions from Mg to g to kg to t

A

/1000 ( x 1000 in the other direction)

18
Q

Conversions from cm³ to dm³ to m³

A

/1000 ( x 1000 in the other direction)

19
Q

Conversion from concentration in mol dm-³ to g dm-³

A

x Molar mass

20
Q

Conversion from Pa to kpa

A

/1000

21
Q

Conversion from C° to K

A

+273