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)
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What is relative formula mass? (of a compound) - Mr
Sum of relative atomic mass of each element in compound
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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
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With this is mind, what would the product weigh if Mg (weight: 24g) reacted with Cl2 (weight: 71g)?
MgCl2 = 24 + 71 = 95g
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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.
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How do you calculate number of moles?
Mass/Ar (relative atomic number) [total weight/weight of one of those elements]
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How many mols are in 48g of Mg (Ar=12)
48/24 = 4 moles
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How do you calculate concentration of a solution?
concentration = mass/volume
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200g of a chemical is dissolved in water to volume of 1 dm3. Calculate concentration.
200g/1 = 200g/dm3
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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
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How do you calculate percentage concentration of mass?
(element mass/compound mass) x 100
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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

Back

Preview of the front of card 3

Card 4

Front

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

Back

Preview of the front of card 4

Card 5

Front

How many grams of an element is one mole?

Back

Preview of the front of card 5
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