Question

Pre-Lab Exercises 1. Indicate the number of significant figures contained in each of the following measurements: a. 25 mL b. 25.0 mL c. 54.7 mL d. 8.5090 g e. 0.0831 g f. 60 kg 2. Perform the following calculations and report the answers with appropriate units and the correct number of significant figures: a. 53.18 g + 1.014 g + 0.3270 g b. 10.35 cm x 4.15 cm x 1.10 cm c. 36.140 g % 4.08 mL 3. A student uses a stoppered 25.0-mL volumetric flask to determine the density of a liquid. The mass of the empty flask and stopper was 25.1841 g. The mass of the stoppered flask filled with liquid up to the scratch mark was 45.0379 g. Calculate the density of the liquid in appropriate units and with the correct number of significant figures. 4. Calculate the error and percent error of a sample of water using the following data: the actual density of water at 23 "C is 0.999765 g mL-1 and the experimental density (at 23 "C) is 1.097 g mL-1. Show your work and watch your significant figures.

          Pre-Lab Exercises
1. Indicate the number of significant figures contained in each of the following
measurements:
a. 25 mL
b. 25.0 mL
c. 54.7 mL
d. 8.5090 g
e. 0.0831 g
f. 60 kg

2. Perform the following calculations and report the answers with appropriate units
and the correct number of significant figures:
a. 53.18 g + 1.014 g + 0.3270 g
b. 10.35 cm x 4.15 cm x 1.10 cm
c. 36.140 g % 4.08 mL

3. A student uses a stoppered 25.0-mL volumetric flask to determine the density of a
liquid. The mass of the empty flask and stopper was 25.1841 g. The mass of the
stoppered flask filled with liquid up to the scratch mark was 45.0379 g. Calculate
the density of the liquid in appropriate units and with the correct number of
significant figures.

4. Calculate the error and percent error of a sample of water using the following data:
the actual density of water at 23 "C is 0.999765 g mL-1 and the experimental density
(at 23 "C) is 1.097 g mL-1. Show your work and watch your significant figures.

Pre-Lab Exercises
1. Indicate the number of significant figures contained in each of the following
measurements:
a. 25 mL
b. 25.0 mL
c. 54.7 mL
d. 8.5090 g
e. 0.0831 g
f. 60 kg

2. Perform the following calculations and report the answers with appropriate units
and the correct number of significant figures:
a. 53.18 g + 1.014 g + 0.3270 g
b. 10.35 cm x 4.15 cm x 1.10 cm
c. 36.140 g % 4.08 mL

3. A student uses a stoppered 25.0-mL volumetric flask to determine the density of a
liquid. The mass of the empty flask and stopper was 25.1841 g. The mass of the
stoppered flask filled with liquid up to the scratch mark was 45.0379 g. Calculate
the density of the liquid in appropriate units and with the correct number of
significant figures.

4. Calculate the error and percent error of a sample of water using the following data:
the actual density of water at 23 "C is 0.999765 g mL-1 and the experimental density
(at 23 "C) is 1.097 g mL-1. Show your work and watch your significant figures.

Added by William M.

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