Empirical Formula

Question 1

Calculating an empirical formula.

What are the steps?

Answer 1

1. ) write the symbol of each element as a header
2. ) write down the mass of each element in g
3. )write down the Ar of each element
4. ) for each element calcular mass / Ar
5. ) divide each answer by smallest answer
6. ) ratio is created

Question 2

How do calculate molecular formula from an empirical formula?
If the mr is.30

Answer 2

Mr of empirical formula e.g ch3=12+(3x1)=15
Divide the 30 by answer 1(15)
30/15 = 2
Multiply each number in the empirical formula by answer 2(2)
Ch3 becomes C2H6

Question 3

Determine empirical formula question practical.

Answer 3

Measure weight of crucible and lid
Mesure crucible, lid and mg before heating
Measure crucible,lid and mg after heating
Calculate mg used and oxygen gained