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Flashcards in Moles and percentages Deck (8)
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1
Q

What is the amount of substance in a chemical reaction measured in?

A

Moles

2
Q

What is the molar mass of a substance?

A

The relative formula mass of the substance

3
Q

How do you calculate the number of moles?

A

Mass ÷ Molar mass

4
Q

Why might the mass at the end of the reaction be greater?

A

Gas has been gained from the air

5
Q

Why might the mass at the end of the reaction be lesser?

A

Water vapour or gas has escaped

6
Q

What is the empirical formula?

A

The simplest whole number ratio of each type of atom in a compound

7
Q

How many CM are in a DM?

A

1000

8
Q

How do you calculate concentration?

A

Mass of solute ÷ Volume of solvent