if 8g CuO is heated, what mass of Cu metal is formed?
2006-11-19 02:50:13 · 7 answers · asked by LiNnY 3 in Science & Mathematics ➔ Chemistry
its my science teacher who set me it. Its givin me a headache..........
2006-11-19 02:53:22 · update #1
Where dsoes the 159 come from???
2006-11-19 03:48:53 · update #2
ohhhh i get it now. thanks.
2006-11-19 03:50:11 · update #3
shawty's NOT good at stoichiometry...has made a fundamental error in the final line so end result is rubbish...
how can you end up with MORE Cu than you started with when it's 2 moles : 2moles?
(8/159)x 127 = 6.4 g
2006-11-19 03:21:48 · answer #1 · answered by drjaycat 5 · 0⤊ 0⤋
assuming that amount of C taken is in excess as compared to CuO. We, have CuO is the limiting agent & its the limiting agent on which the quantity of reactants formed depends.
so, 2 moles CuO gives 2 moles Cu
At. Wt of Cu & O being 63.5 & 16 respectively
mol. Wt of CuO = (16+63.5) = 79.5 g
this means 159 g of CuO gives 127 g Cu
[moles = given wt * mol wt]
therefore 8g CuO would give Cu = (127/159)8 g = 6.8850 g
2006-11-19 12:01:12 · answer #2 · answered by Anonymous · 0⤊ 0⤋
M(Cu)=63.5 g/mol (from periodic table)
M(O)=16 g/mol
m (CuO)= 8g
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from 2CuO (159g) we get 2Cu (127g)
from 8 g of CuO we get X grams of Cu
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159*8=127*X
X=159*8/127
x~10g of Cu
hope i helped
2006-11-19 11:07:57 · answer #3 · answered by CosmicLove 5 · 0⤊ 0⤋
u'll get 5.3 grams of Cu.
2006-11-19 11:08:28 · answer #4 · answered by johnnie c 1 · 0⤊ 0⤋
You may find the answer here http://www.wpbschoolhouse.btinternet.co.uk/page04/Mextract.htm
2006-11-19 11:00:36 · answer #5 · answered by Barry G 4 · 0⤊ 1⤋
ask your sci teacher
2006-11-19 10:51:54 · answer #6 · answered by darren_nnx 2 · 0⤊ 1⤋
huh
2006-11-19 10:51:16 · answer #7 · answered by elijah please 2 · 0⤊ 1⤋