# Louisiana University Compounds Water Moles Lab Report

Science Enhanced Scope and Sequence – ChemistryMoles Lab Activity 3:
Compounds—Water
Materials
Water
Balance
Procedure
Take the necessary measurements, and record them with units. Show all your calculations,
rounding your answers to the teacher-specified number of significant digits and labeling units
clearly.
1. Mass 50.0 mL of water, using the graduated cylinder. Be sure to subtract out the mass of
the cylinder. Record the mass of the water.
2. Find and record the molar mass of water (H2O).
Is 50.0 mL of water less than, equal to, or more than one mole of water?
How many moles of water are in 50.0 mL of water?
How many molecules of water are in 50.0 mL of water?
How many individual atoms of hydrogen are in 50.0 mL of water?
What is the density of your water sample?
data to certify that they are correct.
Extension
1. Solve the problem:
Calculate the percent by mass of each element (H and O) in water (H2O).
Calculate the mass of hydrogen in your 50.0 mL of water.
Calculate the mass of oxygen in your 50.0 mL of water.
Use the density of water to calculate the volume of one mole of water, in mL.
Virginia Department of Education © 2012
19
Science Enhanced Scope and Sequence – Chemistry
One swallow of water is about 20 mL of water. How many moles of water are in one
swallow?
How many molecules of water are in one swallow?
Virginia Department of Education © 2012
20

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