3-5: Empirical Formula
Chapter 3
Dr. Robert Belford & Rebekah Reinhart
Question 1
What is the empirical formula for a compound that is 29% Na, 40.5% S and 30.5% O by mass?
(A)
Na
4
S
4
O
6
(B)
Na
2
S
2
O
3
(C)
NaSO
4
(D)
None of the above
Hint
Your response
Not answered yet
Question 2
What is the empirical formula for a compound containing 70% Fe and 30% O by mass?
(A)
Fe
2
O
3
(B)
FeO
3
(C)
Fe
4
O
3
(D)
None of the above
Hint
Your response
Not answered yet
Question 3
What is the empirical formula of a compound that contains only 43.7 grams N and only 6.3 grams H?
(A)
NH
4
(B)
NH
3
(C)
NH
2
(D)
None of the above
Hint
Your response
Not answered yet
Question 4
What is the empirical formula that is 43.3% sodium, 11.3% carbon, and 45.4% oxygen by mass?
(A)
Na
2
CO
2
(B)
Na
2
CO
3
(C)
NaC
2
O
3
(D)
None of the above
Hint
Your response
Not answered yet
Question 5
What is the empirical formula for a compound that contains only 13.0 grams lead, and only 2.0 grams oxygen?
(A)
PbO
2
(B)
Pb
3
O
2
(C)
Pb
2
O
3
(D)
None of the above
Hint
Your response
Not answered yet