1. A. 0.8 g/mL, B. 0.800 g/mL, C. 1.25 g/mL, D. 1.3 g/mL
QUESTION:
What is the density of a liquid if a 25.0 mL sample of the liquid has a mass of g?
A. 0.8 g/mL, B g/mL, C g/mL, D. 1.3 g/mL
Density is defined as the ratio of mass to volume: Density = mass / volume
= (20.00 g) / (25.0 mL)
= 0.8 g/mL  g/mL
What is the density of a liquid if a 25.0 mL sample of the liquid has a mass of g?
A. 0.8 g/mL, B g/mL, C g/mL, D. 1.3 g/mL
PAUSE
CLICK
Density is defined as the ratio of mass to volume.
Therefore, to calculate density, we simply divide the mass
HIGHLIGHT in yellow “mass” by the volume
HIGHLIGHT in green “volume”
The question gives us g
HIGHLIGHT in yellow “20.00 g”
divided by 25.0 mL
HIGHLIGHT In green “25.0 mL”
which is equal to 0.8 grams per milliliter.
THere are 4 significant digits in grams, and 3 significant digits in 25.0 mL CALLOUT
The less precise term, 25.0 mL has only 3 significant digits. Therefore, we express our answer to 3 significant digits.
We must write as grams per mL
THe correct answer is B.
CLICK PAUSE END RECORDING

2. Video ID: 1A-8-1 © 2008, Project VALUE (Video Assessment Library for Undergraduate Education), Department of Physical Sciences Nicholls State University Author: Glenn V. Lo Narrator: Funded by Louisiana Board of Regents Contract No. LA-DL-SELECT-13-07/08