Question

PRE LAB: CONCENTRATION UNITS & PREPARATION OF SOLUTIONS Name Lab Day & Time Date 5 Points (3 Points if not completed before lab begins) 1. Define mole fraction: The number of moles of a component divided by the number of all components. 2. What is the uncertainty in a 50 mL buret? 3. The density of a solution is 1.27 g/ml. If we have 37.5 grams of this solution, calculate its volume. Show all work. 4. If 23 out of every 280 students wear glasses, calculate the percent of students who wear glasses. Show all work. 5. Calculate the percent uncertainty in measuring out 27.00 mL with a 100 mL buret. Show all work.

          PRE LAB: CONCENTRATION
UNITS & PREPARATION OF SOLUTIONS
Name Lab Day & Time
Date 5 Points (3 Points if not completed before lab begins)
1. Define mole fraction:
The number of moles of a component divided by the number of all components.
2. What is the uncertainty in a 50 mL buret?
3. The density of a solution is 1.27 g/ml. If we have 37.5 grams of this solution, calculate its volume. Show all work.
4. If 23 out of every 280 students wear glasses, calculate the percent of students who wear glasses. Show all work.
5. Calculate the percent uncertainty in measuring out 27.00 mL with a 100 mL buret. Show all work.

$PRE LAB: CONCENTRATION UNITS PREPARATION OF SOLUTIONS Name Lab Day Time Date 5 Points (3 Points if not completed before lab begins) 1. Define mole fraction: The number of moles of a component divided by the number of all components. 2. What is the uncertainty in a 50 mL buret? 3. The density of a solution is 1.27 g/ml. If we have 37.5 grams of this solution, calculate its volume. Show all work. 4. If 23 out of every 280 students wear glasses, calculate the percent of students who wear glasses. Show all work. 5. Calculate the percent uncertainty in measuring out 27.00 mL with a 100 mL buret. Show all work.$

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