Chemistry
Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Stoichiometry
Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "elem…
Question

12.

To convert between mass and number of moles.

The conversion factor between mass and number of moles is called molar mass. By consulting the periodic table , we can determine that the molar mass of NaClNaCl is

23.0 g/mole+35.5 g/mole=58.5 g/mole23.0 g/mole+35.5 g/mole=58.5 g/mole

This number tells us that 1 molemole of NaClNaCl has a mass of 58.5 gg . The conversion factors are

 

58.5 g1 mole58.5 g1 mole         and           1 mole58.5 g1 mole58.5 g

 

Here is an example of the conversion of 12.0 molesmoles of NaClNaCl to grams using the first conversion factor:

12.0 moles×58.5 g1 mole=702 g

 

A.

What is the mass of 8.00 molesmoles of magnesium chloride, MgCl2MgCl2?

Express your answer with the appropriate units.
 
B.
How many moles of nitrogen, NN, are in 78.0 gg of nitrous oxide, N2ON2O?
Express your answer with the appropriate units.
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