4.4 Moles 1

Question 1

How do calculate the Relative Formula Mass

Answer 1

adding the atomic masses

Question 2

how do calculate the percentage Mass

Answer 2

mass of X / RFM (x 100)= %

Question 3

what is the equation for moles

Answer 3

moles= mass (g) /RFM

Question 4

What is the equation for mass

Answer 4

mass = Mole x RFM

Question 5

How do you calculate the % Yield

Answer 5

% Yeild = Actual / Theoretical (x 100)

Question 6

when you lay out the table for the Empirical formulae what is the order

Answer 6

Mass
RFM
mole
ratio
table method
divide by the smallest

Question 7

to calculate the value of x which method should you use

Answer 7

the table method
same as Empirical formular

Question 8

what is the first step to working out the molecular formulae

Answer 8

Working out the mass of the atom by adding together all the elements in the atom

then divide by the RFM given

then times each element by the answer you just worked out above

Question 9

what number do you use of the element when working out the RFM

Answer 9

Top number- atomic mass