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Gcse Combined Chemisty Revison > Calculations > Flashcards

Calculations Flashcards

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1
Q

What is the formula to calculate the number of moles?

A

Moles = Mass ÷ Relative Formula Mass (Mr)

This formula is used in stoichiometry to relate the mass of a substance to the amount in moles.

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2
Q

How do you calculate concentration in chemistry?

A

Concentration = Moles ÷ Volume

Concentration is often expressed in moles per liter (mol/L).

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3
Q

What is relative atomic mass (Ar)?

A

The weighted average mass of an atom compared to 1/12th the mass of carbon-12

Relative atomic mass is a dimensionless quantity and is crucial for understanding elemental mass.

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4
Q

How do you calculate percentage yield?

A

Percentage Yield = (Actual Yield ÷ Theoretical Yield) × 100

This calculation helps assess the efficiency of a chemical reaction.

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5
Q

What is the formula for atom economy?

A

Atom Economy = (Mass of Desired Product ÷ Total Mass of Reactants) × 100

Atom economy is a measure of the efficiency of a reaction in terms of the amount of useful product produced.

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Gcse Combined Chemisty Revison (7 decks)

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