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Unformatted text preview: heml1/lab_1/manual.html 1/5 4/15/13 Lab 1 - M oles, M ass, and Volume has units of grams per mole (g/mol). The molar mass of atoms of each element is characteristic of that element
and is listed on the periodic table. So far, we have talked about moles of atoms, which applies to elements.
What about compounds? Compounds are combinations of elements, which can be expressed as formulas. For
example, water contains two hydrogen atoms and one oxygen atom; its formula is H2O. Its molar mass is the
sum of the masses of the atoms in the following formula.
2 moles of H atoms × 1.0 g/mole of H atoms = 2.0 g
1 mole of O atoms × 16.0 g/mole of O atoms = 16.0 g
18.0 g/mol of H2O
In chemistry, and the quantitative sciences generally, one must often set up calculations involving different units. It
is good practice to use the "conve rs ion factor" approach to do this. For example, in this experiment, you will be
determining how many popcorn kernels you can count in 30 seconds. If you wanted to know how many kernels
you could count in a minute, you would use a conversion factor: 1 min = 60 s, which can also be express...
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This document was uploaded on 01/22/2014.
- Spring '14