Amount Of Substances Flashcards
How do you calculate No. of Particles
No. Of Particles = No. of Moles x Avagadro’s Constant
How do you calculate No. of Moles
No. of Moles = Mass of substance / Mr
How do you calculate Concentration
Concentration = Moles / Volume
State the ideal Gas equation
pV = nRT
Give the formula for Percentage Yield
Percentage Yield = Actual / Theoretical x 100
Give the formula for Atom Economy
% Atom Economy = Mr of desired product / sum of Mr of all reactants x 100
Define relative atomic mass
The average mass of an element relative to one twelth of the mass of an atom of carbon-12
Define relative molecular mass
The mass of a molecule relative to one twelfth the mass of an atom of carbon-12
What is the relative formula mass?
The mass of the formula, relative to one twelfth the mass of an atom of carbon-12
How do you convert between cm and dm?
- Divide cm by 1000 to give dm- 1 dm = 1000 cm
How can volume of gas be calculated?
Volume of gas (dm^3) = moles x 24 (dm^3)
What is the % by mass equation?
(Ar of 1 mole of the element) / (Mr/RFM) all multiplied by 100
How is the ratio of empirical to molecular formula calculated?
Mr/ Empirical Mr
Why is a higher atom economy desirable?
There are less waste products which could be harmful to the environment or expensive to dispose of therefore a higher atom economy will be industrially more economic and safer to the environment
