# Chemistry - Quantitative

What's relative atomic mass? (of an isotope) - Ar
Avarge mass of an elements isotopes,taking into account how common each isotope is (abundance)
1 of 11
What is relative formula mass? (of a compound) - Mr
Sum of relative atomic mass of each element in compound
2 of 11
The law of conservation of mass is that no ___ are lost/gained in reaction so p___ mass = r___ mass
No atoms are lost/gained so product mass = reactant mass
3 of 11
With this is mind, what would the product weigh if Mg (weight: 24g) reacted with Cl2 (weight: 71g)?
MgCl2 = 24 + 71 = 95g
4 of 11
How many grams of an element is one mole?
The atomic number. E.g. Carbon has atomic number of 12. So 12g is 1 mol of that element.
5 of 11
How do you calculate number of moles?
Mass/Ar (relative atomic number) [total weight/weight of one of those elements]
6 of 11
How many mols are in 48g of Mg (Ar=12)
48/24 = 4 moles
7 of 11
How do you calculate concentration of a solution?
concentration = mass/volume
8 of 11
200g of a chemical is dissolved in water to volume of 1 dm3. Calculate concentration.
200g/1 = 200g/dm3
9 of 11
Calculate mass of chemical needed to dissolve to volume 0.4 dm3 to give concentration of 600g/dm3
mass = concentration x volume. 600 x 0.4 = 240
10 of 11
How do you calculate percentage concentration of mass?
(element mass/compound mass) x 100
11 of 11

## Other cards in this set

### Card 2

#### Front

What is relative formula mass? (of a compound) - Mr

#### Back

Sum of relative atomic mass of each element in compound

### Card 3

#### Front

The law of conservation of mass is that no ___ are lost/gained in reaction so p___ mass = r___ mass

### Card 4

#### Front

With this is mind, what would the product weigh if Mg (weight: 24g) reacted with Cl2 (weight: 71g)?

### Card 5

#### Front

How many grams of an element is one mole?