QUESTION 28 Anna dissolves 32. grams of glucose with water and the final volume

Question

QUESTION 28

Anna dissolves 32. grams of glucose with water and the final volume of solute and solvent is 100. mL. What is the concentration of glucose in her solution using the %(m/v) method?

QUESTION 29

Amanda dissolves 0.11 moles of NaCl in 319 ml of solution. What is the concentration of NaCl in the solution using the molarity method? Remember that 1,000 mL = 1 Liter

QUESTION 30

Mellissa dissolves 26. grams of NaF with water to make a 199. mL solution. What is the molarity of the solution? There are 1,000 mL in 1 L.

Explanation / Answer

28)

mass = 32 g

volume = 100 mL

%(m/v) = mass * 100 / volume

= 32*100/100

= 32 %

Answer: 32 %

29)

number of mol = 0.11 moles

volume = 319 mL = 0.319 L

So,

Molarity = number of mol / volume

= 0.11 moles / 0.319 L

= 0.34 M

Answer: 0.34 M

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