Equations And Formulas

Question 1

Relative formula mass

Answer 1

Find the atomic mass of each element, multiply is by number of atoms there are, and add them all together

Question 2

Empirical formula

Answer 2

Simple whole number ratio of atoms of each element

Question 3

How to find the molecular formula from the empirical formula and Mr

Answer 3

First find the Mr of the empirical formula, then see how many times the Mr of the EM goes into the unknown compounds Mr. So the EM Mr goes into the unknown compound x times, then multiply RESPECTIVELY the elements to what you just found

Question 4

Empirical formula in percentages

Answer 4

Find the Ar of the number and divide the percentage by that, then divide by the smallest number, and if its not an integer, multiply respectively to make an integer