Equations😡

Question 1

What is avogadros constant and how is it used to find the number of particles and number of moles?

Answer 1

No particles= no of moles X avogadros constant

How many particles one mole contains
6.02 X 10 to power of 23

Question 2

How can the amount of substance be calculated from mass of substance and molecular mass?

Answer 2

No of moles= mass of substance/molecular mass

Question 3

How would you find the concentration of a solution?

Answer 3

No of moles= conc (mol dm-3) X volume (dm3)

Question 4

What does pV=nRT stand for and what are the units.

Answer 4

Ideal gas equation 
Pressure- pa
Volume- m3 (times by 10 to power 6)
N- no of mole
R- gas constant
T- temperature (K) add 273

Question 5

How do you calculate empirical formula from percentage composition?

Answer 5

Percent divided by atomic mass

Divide each by smallest number

Gives ratio

Question 6

How do you calculate percentage yield?

Answer 6

Percentage yield= actual/theoretical X 100

Question 7

How do you work out atom economy?

Answer 7

% atom economy= molecular mass of desired product/ sum of molecular masses of all reactants X 100