Reactions and Reactivity: Chemical Calculations and Yields |
A chemist measures out molecules or moles not by counting, but by weighing. The molar mass
of a
compound provides the connection between the mass
of a sample of a substance
and the number of moles
of that substance in the sample.
The molar mass can be used
to
set up more realistic calculations from equations. 2Na(s) + Cl2 (g) → 2NaCl(s) Furthermore, the amount of chlorine gas needed could be determined using a similar calculation. Calculation of volumes of gases will be addressed in the chapter on gases, but a similar calculation is used. Question How many grams of chlorine gas are needed to completely react with 46.0 g Na? |
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