What mass of aluminium oxide can be made by burning 54g of aluminium?

i did the following, not 100% sure though

54/(4x26)
ans/2
ans x Mr od Al2O3

to get an answer of 25.96g?

(edited 7 years ago)

Reply 7

alow

Original post by Jassy16

What mass of aluminium oxide can be made by burning 54g of aluminium?

i did the following, not 100% sure though

54/(4x26)
ans/2
ans x Mr od Al2O3

to get an answer of 25.96g?

That's wrong.

Also try not to post full answers, it won't help the OP learn. Read this: http://www.thestudentroom.co.uk/showthread.php?t=4066671&p=64637319#post64637319

(edited 7 years ago)

Reply 8

Jassy16

Original post by alow

That's wrong.

Also try not to post full answers, it won't help the OP learn. Read this: http://www.thestudentroom.co.uk/showthread.php?t=4066671&p=64637319#post64637319

where did i go wrong?

Reply 9

alow

Original post by Jassy16

where did i go wrong?

You don't multiply the atomic mass by the stochiometric coefficient, and the atomic mass of aluminium is not 26.

Reply 10

coconut64

For this, I got 102g for mass of AL2O3? Correct?

Reply 11

alow

Original post by coconut64

For this, I got 102g for mass of AL2O3? Correct?

Sounds good.

Reply 12

coconut64

Original post by alow

Sounds good.

cool

Reply 13

sabahshahed294

Original post by grace_wh

What mass of aluminium oxide can be made by burning 54g of aluminium?

(4Al + 3O2--> 2Al2O3)

First of all, find the moles of aluminium i.e moles of aluminium=mass of aluminium burnt(54)/ molar mass of aluminium (27) then using your balanced equation, compare the moles of Aluminium: Aluminium Oxide which is 4:2. You'll get your moles of Aluminium Oxide and then, you can get the mass of aluminium oxide. (Again, use the formula, mass=moles into molar mass of aluminium oxide)