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27 Cards in this Set
- Front
- Back
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Avogadro constant |
6.02 x 10²³ |
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Molar mass |
Moles = mass ÷ Mr |
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Number of particles |
Moles = no. Of particles ÷ 6.02 x 10²³ |
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Empirical formula |
A. Find moles of individual element Mass÷ Mr B. Ratio (÷ by smallest) |
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Hydrated salts |
A. Moles of compound and water separately (not individual elements) B. Ratio (÷ by smallest) |
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% by mass |
% by mass = (mass of element ÷ Mr of compound) × 100 |
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Stoichiometry |
The ratio of the amount, in moles, of each substance in a chemical reaction |
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Limiting reagents in reacting masses |
A. Calculate moles of both reactants - use limiting reactant in further calculation B. Use ratio from equation to work out unknown mol C. Work out unknown info |
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% yield |
% yield = (acttual mass ÷ theoretical mass) × 100 |
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Atom economy |
Atom economy (sum of molar masses of desired products ÷ sum of molar masses of all products) × 100 |
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Concentration |
Moles ÷ volume |
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Mol dm‐³ |
Mol dm -³ = g dm-³ ÷ Mr |
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Volume |
Moles = vol ÷ 24 |
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If not given Room temp and pressure you do |
pV = nRT |
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Tonnes and kilograms |
1kg = 1000g = 10³ g 1 ton = 1000kg = 1000000g = 10⁶ g |
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Temperature |
°C --> K +273 |
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Pressure |
kPa --> Pa ×10³ |
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Volume |
1dm³ = 1000 cm³ Cm³ --> m³ ÷10⁶ Dm³ --> m³ ÷10³ |
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Pressure |
Pa |
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R |
8.314 |
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Temperature |
K |
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Concentration |
Mol dm-³ |
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Volume |
Dm³ |
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Mass |
Grams |
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Moles |
Mol |
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Molar mass |
Mr |
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Equilibrium |
Kc = [C]c [D]d (products) ------------- [A]a [B]b (reactants) |
