Calculations in Chemistry

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How do you find the moles of a solid or pure liquid substance?
Mass (g) / Atomic mass
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How do you find the moles in a solution (aq)?
Volume (cm^3) / 1000 * Concentration (mol dm^-3)
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How do you find the moles in a gas?
Volume (cm^3) / 24000
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How do you find the % yield?
mass of product made / total expect mass * 100
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How do you find the atomic mass of an element with isotopes?
(% in atmosphere * atomic mass)+(% * mass) / 100
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How do you find the energy transferred (J)?
mass (g) * 4.2 * change in temperature (celcius)
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How do you find the enthalpy change (KJmol^-1)
Energy transferred / no. of moles
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How do you find the bond enthalpy?
The bonds broken - the bonds made
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How do you find the quantity of charge (coulombs) in electrolysis?
Current * time
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How much charge (coulombs) is 1 mole of electrons in electrolysis?
96500 C => moles of elecrons = charge / 96500
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Card 2

Front

How do you find the moles in a solution (aq)?

Back

Volume (cm^3) / 1000 * Concentration (mol dm^-3)

Card 3

Front

How do you find the moles in a gas?

Back

Preview of the front of card 3

Card 4

Front

How do you find the % yield?

Back

Preview of the front of card 4

Card 5

Front

How do you find the atomic mass of an element with isotopes?

Back

Preview of the front of card 5
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