What mass of glucose (c6h12o6) is needed to prepare 200.0 ml of a 2.50M glucose solution?

Question

anonymous · Answer

I converted the ml to Liters which is 0.2 L
I also found the molar mass of glucose which is180g/mol.

jfraser · Answer

you need just one more step. You need to use the molarity and the volume of solution you have to make in order to find the $moles$ of glucose needed to make that solution

anonymous · Answer

okay but I have the molarity of 2.50M how do I use that in the formual of 

moles of solute/volume of solution (L)?

anonymous · Answer

@JFraser

jfraser · Answer

that 2.5M $IS$ the ratio. You need to rearrange the equation to solve for the moles$$2.5M = \frac{2.5 moles}{1L}$$

jfraser · Answer

you need to make 0.200L of solution, so use the concentration as a conversion factor

jfraser · Answer

$$0.200 \cancel{L} * \frac{2.5 moles}{\cancel{1L}}$$

anonymous · Answer

oh okay!! I see so will I do this each time when I see a problem asking for the mass ? since the Molarity is already given....