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Johnny needs to make a 1.8 m solution of c6 h12 o6. His teacher gave him 750ml of 1.5m c6 h12 o6. How much water must be added or taken away? How many moles of c6 h12 o6 are present in the final solution?

Answer 1

The question is very poorly proposed....

You want a #1.8*mol*L^-1# solution of glucose in WATER. You are given a #1.5*mol*L^-1# solution of glucose. Water is an exceptionally involatile solvent, and would require a lot of work to strip off the excess water.

The question should have proposed a MORE concentrated solution of glucose...the which could have been facilely diluted.

As always....#"concentration"="moles of solute"/"volume of solution"#..and thus usually has units of #mol*L^-1#...

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.