Chemistry Required Equations

Question 1

What is the equation for RAM (Relative Atomic Mass)?

Answer 1

(mass of isotope1 x % + mass of isotope 2 x %) / 100

Question 2

What is the equation for Rf value

Answer 2

Rf = dot distance/solvent front distance

Question 3

What is the equation for moles?

Answer 3

moles = mass/RAM or Ar or Mr

Question 4

What is the equation for volume of a gas?

Answer 4

mass of gas/Mr of gas x 24

Question 5

What is the equation for concentration?

(concentration in g/dm^3)

Answer 5

concentration = mass of solute / volume of solution

Question 6

What is the equation for concentration?

(concentration in mol/dm^3)

Answer 6

concentration = moles/volume

Question 7

What is the equation for atom economy?

Answer 7

atom economy = RFM of desired product/RFM of all reactants x 100

Question 8

What is the equation for percentage yield?

Answer 8

% yield = mass of product made/maximum theoretical mass x 100

Question 9

What is the equation for rate?

Answer 9

Rate = increase in product or decrease in reactant/time taken

Question 10

What is the equation for percentage mass of an element in a compound?

Answer 10

Ar x no. of atoms of the element / Mr of compound x 100