how many grams of glucose would you have to weigh out to make 500 mls of a 0.5M solution of glucose?

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if someone can help me at least start the solution or help me understand the steps, please, i’m struggling to understand it….thank you alot.

Anonymous · Accepted Answer

Molar mass of glucose = 180.16 g/molThis means that 1 mole of glucose = 180.16 g.A 1M solution contains 1 mole per litre, that is, for glucose, 180.16 g per litre.So, 1M glucose = 180.16 g/LYou only need 0.5M, so you divide the number of grams by 2.(Half the amount of solute in 1 litre gives you half the molarity)Therefore, 0.5M = 180.16 / 2 = 90.08 g/LSo you now have a 0.5M solution which has 90.08 grams glucose in 1 litre,but you only need half a litre (500 mL).Half a litre will contain half the quantity of glucose, which is 90.08/2 = 45.04 g.So, to make 500 mL of a 0.5M solution of glucose, you add 45.04 g glucoseto a flask and make up the rest of the volume to a total of 500 ml with water.This is the definition of molarity in that it is the number of moles of soluteper litre of SOLUTION, not the number of moles of solute per litre of WATER.That is, don&rsquo;t make the mistake of adding 500 mL of water to the glucose,or the total volume will be more than 500 mL.

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how many grams of glucose would you have to weigh out to make 500 mls of a 0.5M solution of glucose?

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