moles/solutions.
posted by sarah .
I have three questions. The first one I got an ansser of 6.02 X 10^23. The question is this.
How many molecules of sucrose (C12,H22, O11) molecular weight, 342, would be present in one mole of sucrose?
The other two questions I have are related.
A) The molecular weight of glucose is 180 Daltons. To make a 1 M solution of glucose, you should do which of the following
qDissolve 180 mg (milligrams) of glucose in 1 L of water.
rDissolve 100 g of glucose in 1 L of water.
sDissolve 180 g of glucose in water, and then add more water until the total volume of the solution is 1 L (this is what I got)
tDissolve 1 g of glucose in 1 L of water.
uDissolve 180 g of glucose in 100 g of water.
I will ask the last question at another time. Am I on the right track?
I have three questions. The first one I got an ansser of 6.02 X 10^23. The question is this.
How many molecules of sucrose (C12,H22, O11) molecular weight, 342, would be present in one mole of sucrose?
There are 6.02 x 10^23 molecules in a mol of anything.
The other two questions I have are related.
A) The molecular weight of glucose is 180 Daltons. To make a 1 M solution of glucose, you should do which of the following
qDissolve 180 mg (milligrams) of glucose in 1 L of water.
rDissolve 100 g of glucose in 1 L of water.
sDissolve 180 g of glucose in water, and then add more water until the total volume of the solution is 1 L (this is what I got) This is the correct answer. Good work!
tDissolve 1 g of glucose in 1 L of water.
uDissolve 180 g of glucose in 100 g of water.
ok, last question I have regarding this and I appreciate it. I am confused about this next one.
The molecular weight of glucose (C6, H12, O6) is 180 Daltons. To make a 0.5 solution of glucose, you hsould
ldissolve 12 g of glucose in 1 L of water.
mdissolve 180 g of glucose in a small volume of water, and then add more water until the total volume of the solution is 1 L.
ndissolve 24 g of glucose in 1 L of water.
odissolve 90 g of glucose in a small volume of water and then add more water until the total volume of solution is 1 L. ( I think this is it.)
pdissolve 0.5g of glucose in 1 L of water.
I assume you intended to write 0.5 M. If so your answer is correct. Good work again!
Just remember two things about molarity. One is that you ALWAYS dissolve the solute in a little water (assuming water is the solvent), THEN add water until the final volume is reached, in this case 1 L. The other thing to remember is that molarity = mols/L of solution. Thus, you want 0.5 M; therefore, you want 0.5 mol/L and 0.5 mol is 1/2 x 180 g/mol = 90 grams. The only part of your answer I might quibble about is that you don't need periods or commas between the elements and subscripts. We can't write subscripts on these boards, at least not easily, so we just write them inline as C6H12O6. Everyone knows we mean subscript. For superscripts, such as 10 to the 3 power, we write 10^3 and denote the exponential part with the carat. Thanks for posting. Also, thanks for telling us what you think is the correct answer.
Respond to this Question
Similar Questions

ochem
Calcualte how many milliliters of carbon dioxide would be produced theoretically from 20g of sucrose of 25 degree C and 1 atmosphere pressure. I can use the formula PV=nRT 20g C12H22O11 * moles sucrose/342.3g suc. that would equal: … 
chemistry
If you are given a 2.0 M solution of sucrose, describe in detail how you would make the following solutions (include specific glassware): a. 500 ml of 1.2M sucrose b. 300 ml of 0.55M sucrose 
chemistry
Two aqueous solutions of sucrose, C12H22O12, are mixed. One solution is 0.1495 M sucrose and has d = 1.018 g/mL; the other is 12.00 sucrose by mass and has d = 1.038 g/ml. Calculate the moles C12H22O12 percent in the mixed solution. … 
chemistry
Two aqueous solutions of sucrose, C12H22O12, are mixed. One solution is 0.1495 M sucrose and has d = 1.018 g/mL; the other is 12.00 sucrose by mass and has d = 1.038 g/ml. Calculate the moles C12H22O12 percent in the mixed solution. … 
chemistry
Two aqueous solutions of sucrose, C12H22O12, are mixed. One solution is 0.1495 M sucrose and has d = 1.018 g/mL; the other is 12.00 sucrose by mass and has d = 1.038 g/ml. Calculate the moles C12H22O12 percent in the mixed solution. … 
chemistry
Two aqueous solutions of sucrose, C12H22O12, are mixed. One solution is 0.1495 M sucrose and has d = 1.018 g/mL; the other is 12.00 sucrose by mass and has d = 1.038 g/ml. Calculate the moles C12H22O12 percent in the mixed solution. … 
chemistry
Two aqueous solutions of sucrose, C12H22O12, are mixed. One solution is 0.1495 M sucrose and has d = 1.018 g/mL; the other is 12.00 % sucrose by mass and has d = 1.038 g/ml. Calculate the moles C12H22O12 percent in the mixed solution. … 
chemistry
Two aqueous solutions of sucrose, C12H22O12, are mixed. One solution is 0.1495 M sucrose and has d = 1.018 g/mL; the other is 12.00 % sucrose by mass and has d = 1.038 g/ml. Calculate the moles C12H22O12 percent in the mixed solution. … 
Chemistry
How many grams of sucrose (molecular weight = 342.3 g/mol) would you dissolve in 350 ml to get a 7% solution? 
Chemistry
You purchased a 5.00 pound bag of sugar (sucrose, C12H22O11) at the grocery last week to bake cookies. Conversion: 1 pound = 1 lb = 454 grams. a.How many grams of sucrose did you purchase?