timed quiz help

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Hi!

I have a quiz due and I REALLY need help on it because I’m having trouble understanding the problems. Exampls of the problems are:

How many grams of glucose are needed to prepare 455 mL of a 1.2 %(m/v) glucose solution?

How many milliliters of a 15.2 % (m/v) NaCl solution would contain 34.8 g of NaCl?


What is the concentration, in m/m%, of a solution prepared from 50.0 g NaCl and 268 g of water?


etc.

The quiz is timed and I only have 20 minutes to answer all these questions. If you can help, please contact me ASAP. There are only 10 questions. Thanks in advance!

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