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13 Cards in this Set
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- Back
- 3rd side (hint)
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definition of relative atomic mass Ar
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The mass of one atom of it relative to its mass of one atom of 12, which has a mass of exactly 12 units on the atomic mass scale.
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The relative molecular mass Mr
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of a substance is the sum of the relative atomic masses of all the atoms in a molecule of that substance.
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The mole (mol)
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The quantity of a substance which contains as many particles (atoms,molecules or ions)atoms there are atoms in exactly 12 of 12 C.
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Avogadro's Constant (or Avogadro's number)
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L,is the number of atoms present in 12 g of 12 C.The value of Avogadro's Constant is 6.022 x10 (23) mol-(1)
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unit for molar mass
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g mol-1
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molar mass
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Is the the mass of 1 mole of the substance in grams.
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What is the relationship between mass (m) and Molar mass (M) is
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number of moles (n)=mass÷molar mass
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The equation
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The molar volume
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Is the volume occupied by 1 mole of a gas and it's value is 22.4dm (3) for any gas at standard temperature and pressure (stp).Standard temperature is 0°c (273k) and standard pressure 1 atmosphere (1atm)
At room temperature (20°C or 293K) and 1 atm pressure (rtp ) the value of the molar volume is approximately 24.0dm (3) |
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How do you work out percentage yield
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a molar solution
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Is one which contains 1 mole of solute in 1 dm (3) of solution
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molarity (molar concentration )
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of a solution is the number of moles of solute present in 1 dm (3) of a solution.
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whats the unit for molarity
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mol dm(-3)
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How to work out molarity
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