Chemical Composition Questions
Calculate the gram formula weight of AlCl
3
* 6H
2
O
Calculate the molecular formula for a compund that is 30.43% N, and the rest O. It's molecular weight is 92
NO
NO
2
N
2
O
4
N
4
O
2
How many moles are contained in 20 grams of H
3
PO
4
?
Determine the molecular formula for the following compound: 40.0% C, 6.6% H, and 53.4% O with a molecular weight of 90 g/mole.
CH
2
O
2
C
3
H
6
O
3
C
2
H
4
O
2
CHO
How many molecules in 1.1 kg of aluminum bromide?
250000
3.5 X 10
24
25 X 10
26
2.5 x 10
24
A compound has the composition: 24.7% calcium, 1.2% hydrogen, 14.8% carbon, and 59.3% oxygen. What is its empirical formula?
Ca
2
(HCO
3
)
4
Ca(HCO
3
)
2
CaHCO
Ca(HCO)
2
How many grams of carbon are contained in a 15g sample of acetic acid?
Answers