cheeky teas on january

Question 1

What is the relative formula mass?

Answer 1

Mr (compound or molecular element) = sum of the Ar of every atom in the formula

Question 2

Percentage composition?

Answer 2

% composition of an element in a compound= find the masses and add them up, take the mass of the one you want and put it under the total mass. times the answer by 100 and voalla u got it m8

Question 3

Explain moles

Answer 3

mass g = moles X Mr or Ar

moles = mass (g) over Mr or Ar

use mr for compounds and elements which exist as molecules ie, H2 N2 O2, and all group VII

Question 4

how do I change values to grams

Answer 4

tones to grams X ten to the 6
kg to g times 10 to the 3
mg to g times 10 to the -3

Question 5

What is relative atomic mass?

Answer 5

It is found in periodic table and is bigger than the 2 number, on your data, it will be the top number up read the key.