mass of each -> mr > moles > /smallest mole
hii even im stuck in this. I got CH2.
Original post by lunariumxo
mass of each -> mr > moles > /smallest mole
i did this, but got A instead of B
hi! im actually doing this right now!
1) first work out mass
so hydrocarbon mass= 7.2g
carbon= 6g
hydrogen= hydrocarbon - carbon
= 7.2 - 6 = 1.2g
2) work out moles
carbon mol= 6/12= 0.5
hydrogen mol= 1.2/1 = 1.2
3) work out ratio
divide by the smallest to get ratio!:
carbon= 0.5/ 0.5= 1
hydrogen= 2.4
4) times till u get a whole number!
hydrogen= 2.4 x 5 = 12
therefore carbon= 1 x 5= 5
so therefore the empirical formula is C5H12
I hope this helped!!!
1) first work out mass
so hydrocarbon mass= 7.2g
carbon= 6g
hydrogen= hydrocarbon - carbon
= 7.2 - 6 = 1.2g
2) work out moles
carbon mol= 6/12= 0.5
hydrogen mol= 1.2/1 = 1.2
3) work out ratio
divide by the smallest to get ratio!:
carbon= 0.5/ 0.5= 1
hydrogen= 2.4
4) times till u get a whole number!
hydrogen= 2.4 x 5 = 12
therefore carbon= 1 x 5= 5
so therefore the empirical formula is C5H12
I hope this helped!!!
Original post by itss0ph
hi! im actually doing this right now!
1) first work out mass
so hydrocarbon mass= 7.2g
carbon= 6g
hydrogen= hydrocarbon - carbon
= 7.2 - 6 = 1.2g
2) work out moles
carbon mol= 6/12= 0.5
hydrogen mol= 1.2/1 = 1.2
3) work out ratio
divide by the smallest to get ratio!:
carbon= 0.5/ 0.5= 1
hydrogen= 2.4
4) times till u get a whole number!
hydrogen= 2.4 x 5 = 12
therefore carbon= 1 x 5= 5
so therefore the empirical formula is C5H12
I hope this helped!!!
1) first work out mass
so hydrocarbon mass= 7.2g
carbon= 6g
hydrogen= hydrocarbon - carbon
= 7.2 - 6 = 1.2g
2) work out moles
carbon mol= 6/12= 0.5
hydrogen mol= 1.2/1 = 1.2
3) work out ratio
divide by the smallest to get ratio!:
carbon= 0.5/ 0.5= 1
hydrogen= 2.4
4) times till u get a whole number!
hydrogen= 2.4 x 5 = 12
therefore carbon= 1 x 5= 5
so therefore the empirical formula is C5H12
I hope this helped!!!
Oh my gosh! Thank you so much. I didn't know that you'd have to multiply to get a whole number. I just rounded off the ratio 😂
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