A hydrated substance was found to have the following percent composition:  Na = 16.1 /23.0  0.7/0.34% = 2 C = 4.2/12.01     0.349/0.349 = 1 O = 16.8/16        1.05/0.349 = 3 H2O = 62.9/18   3.494/0.349 = 10   A sample of 5.82g of this substance was heated in a crucible. Calculate the mass of the anhydrous salt that would remain in the crucible.

Chemical Principles in the Laboratory
11th Edition
ISBN:9781305264434
Author:Emil Slowinski, Wayne C. Wolsey, Robert Rossi
Publisher:Emil Slowinski, Wayne C. Wolsey, Robert Rossi
Chapter6: Properties Of Hydrates
Section: Chapter Questions
Problem 1ASA: A student is given a sample of a pink manganese (II) chloride hydrate. She weighs the sample in a...
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Data

 

Unknown used: D

 

Data Table 

 

Mass of empty crucible and lid

35.194g

Mass of crucible, lid, and hydrate

42.559g

Mass of hydrate

7.365g

Mass of crucible; lid, and sample after first heating

41.414g

Mass of crucible; lid, and sample after second heating

41.409g

Mass of anhydrous salt after all heatings

6.211g

Mass of water given off

1.154g

Mass of one mole anhydrous salt 

106

 

  1. A hydrated substance was found to have the following percent composition: 

Na = 16.1 /23.0  0.7/0.34% = 2

C = 4.2/12.01     0.349/0.349 = 1

O = 16.8/16        1.05/0.349 = 3

H2O = 62.9/18   3.494/0.349 = 10

 

  1. A sample of 5.82g of this substance was heated in a crucible. Calculate the mass of the anhydrous salt that would remain in the crucible. 
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