# Formulae, Equations & Amount of Substance

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• Created by: euhque123
• Created on: 16-09-17 09:40
What is a mole?
A mole is the amount of any substance in grams that contains the same no. of particles as atoms in 12g of carbon-12.
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What is RAM (Relative Atomic Mass)?
RAM is the average mass of one atom compared to 1/12 the mass of a carbon-12 atom.
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What is molar mass?
Molar mass is the mass in grams of 1 mole of any substance. It's unit is g/mol.
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What equation do we use for pure solids and gases?
Amount = Mass/Molar Mass (n = m/Mr) where, amount (n) = moles (mol); mass (m) = grams (g) & molar mass (Mr) = grams per mole (g/mol).
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What equation do we use for gases?
Gas Volume = Amount x 24 (v = n x 24) where, gas volume (v) = decimeter per cube (dm3); amount (n) = moles (mol) & 24dm3 (24,000 cm3 or 0.24m3) which is the volume of 1 mole of gas at RTP.
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What is RTP (Room Temperature & Pressure) and STP (Standard Temperature & Pressure)?
RTP = 25C (-248K) & 1 atm; STP = 0C (273K) & 1 atm.
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What equation do we use for solutions?
Concentration = Amount/ Volume (c = n/v) where, concentration (c) = mole per decimeter cube (mol/dm3) amount (n) = moles (mol); volume (v) =
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## Other cards in this set

### Card 2

#### Front

What is RAM (Relative Atomic Mass)?

#### Back

RAM is the average mass of one atom compared to 1/12 the mass of a carbon-12 atom.

### Card 3

#### Front

What is molar mass?

### Card 4

#### Front

What equation do we use for pure solids and gases?

### Card 5

#### Front

What equation do we use for gases?