The Mole
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1
What is a mole in chemistry?
A mole is a very large number of particles.
2
What unit is used to measure the amount of a substance?
Amount of substance is measured in moles (mol).
3
How many particles are in one mole?
One mole contains 6.02 x 10²³ particles.
4
What is Avogadro’s constant?
Avogadro’s constant is 6.02 x 10²³.
5
What formula is used to find the number of particles?
Number of particles = Number of moles x Avogadro’s constant.
6
How is the mass of one mole of a substance determined?
1 mole of a substance has a mass equal to its Mr in grams.
7
What is the mass of one mole of water (H₂O)?
The Mr of water is 18, so one mole weighs 18g.
8
What formula is used to calculate the number of moles from mass?
Number of moles = mass of substance / Mr.
9
How is the concentration of a solution measured?
Concentration of a solution is in mol dm⁻³.
10
What formula is used to find concentration in mol dm⁻³?
Concentration = moles/volume (dm³).
11
How do you convert cm³ to dm³?
1 dm³ = 1000 cm³.
12
What equation is used to calculate moles of a gas?
The ideal gas equation is pV = nRT.
13
In the ideal gas equation, what does "p" represent?
In pV = nRT, p stands for pressure in Pascals.
14
In the ideal gas equation, what does "V" represent?
In pV = nRT, V stands for volume in m³.
15
In the ideal gas equation, what does "n" represent?
In pV = nRT, n stands for number of moles.
16
In the ideal gas equation, what does "T" represent?
In pV = nRT, T stands for temperature in Kelvin.
17
What is the value of "R" in the ideal gas equation?
In pV = nRT, R is the gas constant, 8.31 J K⁻¹ mol⁻¹.
18
How do you convert Celsius to Kelvin?
To convert ˚C to K, add 273.
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