Amount of Substance Flashcards
What does Avogadro constant represent
The number of atoms per mole of a given substance
What is the ideal gas equation
pV=nRT
Pressure(Pa)
Volume(m3)
Gas Constant(8.314)
Temperature(K)
What is 1 atm =
101,000 Pa
What does 0 degrees c = in K
273
What does concentration of solution mean
It is the amount of solute dissolved in 1 dm3 of solvent
What is a standard solution
A solution of known concentration
What are the steps to prepare a standard solution
- Weigh the solute using the weigh by diffrence method
- In a beaker dissolve the solute using the solvent
- Pour the solution into a volumetric flask
- Rinse the beaker using the solution and add it to the flask
- Add solvent to the flask carefully untill it reaches the graduation line
- Mix the solution thoroughly to ensure complete mixing
What does percentage yield mean
The effciency of which reactants are converted into products
What are the reasons for not obtaining 100% Yield.
Name 3
- Reaction may be at equilbrium
- The reactants may be impure
- Side reactions could happen
- Reactants or products may be left behind while transferring
- Loss of products
Percentage Yield Calc
Actual amount of product / theretical amount of product x 100
What does atom economy tell us about
The proportion of desired products compared with all the products formed in the reaction
Atom economy calculation
Atom Economy = Molecular mass of desired product/ sum of the moleuclar masses of all products x 100
Does 100% yield mean 100% atom economy
No, even if all the reactants are converted into products not all products of the reaction will be required for products
Which type of reaction has 100% atom economy
Addition Reactions ( two or more reactants are combined to form a product)
