Posted by **bf** on Sunday, January 24, 2010 at 11:30pm.

now am stuck on how to find the grams of X+Y=1.10

X for glucose and Y for sucrose

i had 3.78=M0.08206*298

3.78/24.45=0.1546M

0.1546*0.025=0.003865 moles. now am stuck. help please

- chemistry -
**DrBob222**, Sunday, January 24, 2010 at 11:42pm
First mistake.

3.78 = M*0.08205*298

Solve for M.

Then M = moles/L

L = 0.025, not 24.45.

Then you solve two simultaneous equations which I set up earlier. It becomes a math problem then, and not a chemistry problem. I assume you know how to solve two equations simultaneously.

(X/180) + (Y/342) = moles

X + Y = 1.10 grams.

========================

Solve equation 2 for, say, X.

X = 1.10 - Y

Now substitute X (which is now 1.10-Y) into equation 1 and solve. The X will disappear, Y will be what you solve for, then substitute Y back into equation 2. You now have X and Y; ;i.e., grams glucose and grams sucrose. Then you can do percent from this.

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