# C5 Formulas

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What is the formula for the number of moles in a given mass?
Mass in g (of element or compound)/Mr (of element or compound)
1 of 8
What is the formula for concentration (in mol/dm cubed)?
No. of moles/volume (in dm cubed)
2 of 8
What is the formula for percentage composition by mass of compounds?
Ar x No. of atoms (of that element)/Mr (of whole compound) x 100
3 of 8
What is the formula for the No. of moles?
Mass (in g)/relative formula mass
4 of 8
how do you convert moles per dm cubed into grams per dm cubed?
Mass (in g) = No. of moles x relative formula mass
5 of 8
How do you use the sodium content to estimate the mass of salt present?
Amount of sodium x ratio of sodium chloride's Mr to sodium's Ar (58.5/23)
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How do you find the volume of a gas at RTP?
Volume (dm cubed) = moles of gas x 24
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what is 1dm cubed in cm cubed?
1000cm cubed
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## Other cards in this set

### Card 2

#### Front

What is the formula for concentration (in mol/dm cubed)?

#### Back

No. of moles/volume (in dm cubed)

### Card 3

#### Front

What is the formula for percentage composition by mass of compounds?

#### Back ### Card 4

#### Front

What is the formula for the No. of moles?

#### Back ### Card 5

#### Front

how do you convert moles per dm cubed into grams per dm cubed?

#### Back 