hi Tupu, what school do u go to? I have an exam on that on Tue.
Hope I can help:
use the formula
n=m/M
n=moles (first find for 1 mol)
m=mass
M=molar mass (in this case F:19)
1mol= x g / 19g/mol
you can then rearrange the equation so that it's m=Mn : m=1(19) => m= 19g
in 1.5 mols there are: 1mol=19g
1.5 mol= ? ,1.5 mol= 28.5g
In 1 mol there are 6.02*10²³ atoms so your conversion-factor is 1/ 6.02*10²³
Now, I'm slightly confused because that would mean I'm disregarding my previous steps, but then what I would do is:
1.5mol * 6.02*10²³/mol (now the moles cancel and what you get is that there are 9.03*10²³ atoms in 1.5 moles of flourine gas...)
did this help? was I somewhat correct? By answering that you'd be helping me in my Exam!!!! Thx
