Three Preliminary questions (1 Viewer)

[Dragonmaster262]

Q) Calculate the empirical formula:

93.7% carbon
6.3% hydrogen

Q) Write the chemical formula of the following:

a) nickel hydrogen carbonate
b) iron(2) sulfate heptahydrate

 

[kaz1]

Been a while since I done this.

n=m/M
n[carbon]=93.7/12.01=7.8
n[hydrogen]=6.3/1=6.3

7.8/6.3=26/21

therefore C₂₆H₂₁

 

[Dragonmaster262]

Thanks anyone got answers for the other 2?

 

[randomnessss]

Q) Write the chemical formulas of the following:

a) nickel hydrogen carbonate: Ni(HCO3)2
b) iron(2) sulfate heptahydrate FeSO4.7H2O

 

[rufous]

As kaz1 suggested but use 1.008 for H and you get a ratio which is 1.248:1 and this may be rounded to 1.25:1 ultimately giving you a ratio of 5:4 ie C5H4.