Quantitate chemistry
- Created by: 12nrailton
- Created on: 05-05-19 14:29
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- Quantitate chemistry
- Relative Formula Mass
- Sum of the relative atomic masses of the atoms in the numbers shown in the formula
- Balanced equation= sum of the relative formula of the masses of the reactants = the sum of the relative formula masses of the products
- Number of atoms,molecules or ions in a mole= Avogadro Constant
- Moles
- Mass of 1 mole in grams is numerically equal to its relative formula mass
- 1 Mole of a substance contains the same number of the stated particles, atoms, molecules or ions as o1 mole of any other substance
- Avogadro Constant=6.02x10 to the power of 23
- Moles
- Moles
- Mass of 1 mole in grams is numerically equal to its relative formula mass
- 1 Mole of a substance contains the same number of the stated particles, atoms, molecules or ions as o1 mole of any other substance
- Mass=moles/Mr
- Conservation of mass
- No atoms are lost/ made during a chemical equation so the mass of products = mass of reactants
- Reacting Mass
- Masses of reactants and products can be calculated from balanced equations
- Yield & Atom Economy
- It is not always possible to obtain the calculated amount of a product because:
- The reaction may not go to completion because the equation is reversible
- Some of the product may be lost when it is separated from the reaction mixture
- Some of the reactants may react in ways different to the expected reaction
- Amount of a product obtained is known as the yield
- %yield=mass of product actually made/ Maximum theoretical mass of product X100
- Atom Economy is a measure of the amount of starting materials that end up as useful products.
- Atom Economy=Relative formula mass of desired product from equation/ Sum of relative formula masses of all reactants from equation X100
- It is not always possible to obtain the calculated amount of a product because:
- Gas Volumes
- Equal amounts in moles of gases occupy the same volume under the same conditions of temp and pressure
- The Volume of any gas at room temp and pressure is 24dm cubed
- Volume= Mass of gas/ Mr of gas X 24
- Relative Formula Mass
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