I am having trouble with Chem questions and I was hoping someone could walk me through.?

First, let's look at the definition of molarity: The number of moles of solute (what's being dissolved) in one liter of solution (what it's being dissolved in).

M = mol / L

So, first we need to find out how many moles of glucose you have. The MW of glucose (C6H12O6) is 180 g/mol.

100 g x (1 mol / 180 g ) = 0.556 mol

Now, plug that into our molarity equation:

M = 0.556 mol / 0.5 L

M = 1.112 mol/L

In other words, you have a 1.112 M sugar solution.

Molecular mass of glucose = 180.16 g/mol

Amount in mols of glucose you have =

___ = 100 g/(180.16 g/mol) = 0.5551 mol

Neglecting any increase of volume due to the glucose itself, here is the molar concentration = 0.5551 mol/(0.5L) = 1.110 mol/L

molar concentration also known as Molarity, M, is moles/volume (moles/L). Now you have grams of glucose. In order to convert to moles you need to use the molecular weight of glucose to determine the amount of moles in 100grams glucose. Molecular weight unit is gram/moles. So once you have the moles you just divide by the volume.

Molarity=(w/m)*(1/v)

w=wt in grams, m= molar wt in g/mol,

v=vol in litres

for glucose m=180g/mol

so molarity = (100/180)*(1/0.5)

=1.111mol/litre

Read this...

http://web.njit.edu/~kebbekus/ugenvchem/hw%20solut...

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