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Chemistry Year 11 Content > Quantitative Chemistry > Flashcards

Flashcards in Quantitative Chemistry Deck (6)
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1
Q

How to find the relative formula mass:

A

Add up the relative atomic masses together (times by the small number at the end if there is one)

2
Q

Percentage mass of an element in a compound

A

Ar x number of atoms of that element

3
Q

How to find the percentage mass of sodium carbonate Na2CO3

A

Find the Mr = 106

Percentage mass of sodium=43%

4
Q

Describe the law of conservation of mass:

A

The law of conservation of mass says that no atoms can be created or destroyed in a chemical reaction. Therefore, the total mass of reactants must equal the total mass of products.

5
Q

What is the Law of Conservation of mass?

A

Total mass of reactants=total mass of products

6
Q

What is relative (molecular) mass?

A

Mr= sum of (Ar)