[Soulshine]

Is it a Thorium-234 or just Thorium for haveing a mass number of 234 and containing atoms of 60% more neutrons that protons?

[Astrokel]

Yes you are right, Thorium-234, an isotope of thorium and yes it has 60% more neutrons than protons.

http://en.wikipedia.org/wiki/Thorium

[Soulshine]

Another one of my answer that needs correcting is this:

When H2 is mixed with Iron III oxide at 400*C, black remnants appear: a compound that is 72.3% Fe and 27.7% O by mass. What is the empirical formula for the black residue?

Is the empirical formula is FeO?

Fe = 72.3g / 56.0g mole = 1.29 mole

O = 27.7 / 16.0 g mole = 1.73 mole

Fe = 1.29 / 1.73 = .7
O = 1.73/ 1.73 = 1

.7 is wrong, right?

[Astrokel]

Fe = 1.29 / 1.73 = .7
O = 1.73/ 1.73 = 1

you should divide by smallest ratio and you cannot approximate 0.7 to 1. Scale up to a whole number once you have divide by the smallest ratio.

[Soulshine]

Fe = 1.29 / 1.73 = .7
O = 1.73/ 1.73 = 1

you should divide by smallest ratio and you cannot approximate 0.7 to 1. Scale up to a whole number once you have divide by the smallest ratio.

Umm  divide by smallest ratio, so .7/.7? Other than my error for my equation, is the empirical equation FeO? 

[Astrokel]

No it is not FeO. Sorry perhaps it was not cleared, i meant divide by smallest mole.

Fe= 1.29/1.29
O= 1.73/1.29

[Soulshine]

No it is not FeO. Sorry perhaps it was not cleared, i meant divide by smallest mole.

Fe= 1.29/1.29
O= 1.73/1.29

It's me, I'm really slow learning chemistry.
Now, I'm stuck trying to figure out what's it empirical formula. Both have the ratio of 1. Since it was only asking for the black residue, I thought it would just be FeO. Fe2O3?

[Astrokel]

Both have the ratio of 1.

Fe = 1.29/1.29 = 1
O = 1.73/1.29 = 1.3411

You cannot approximate 1.3411 to 1. you have to scale up to a whole number. It's okay to be slow, as long as you have tried!