Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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need some help witht his pre lab
Transcribed Image Text:Preweighed samples of 3 salts were placed on separate watch glasses and allowed to
remain exposed to the air for 2 hr. At that time the following observations were
recorded:
Salt 1. Increase in weight and slightly moist
Salt 2. Decrease in weight and powdery
Salt 3. Increase in weight and significantly dissolved
For each salt, indicate whether it is a hydrate or anhydrous and whether it is deliquescent,
hygroscopic or efflorescent:
Salt 1
Salt 2
Salt 3
2.
A hydrated salt is 21% water (anhydrous formula weight is 136.1).
a. How many grams of water would be in 100.0 g of the hydrate?
b. How many grams of anhydrous salt would be in 100.0 g of the hydrate?
c. How many moles of the anhydrous salt would be in 100.0 g of the hydrate?
d. How many moles of water in 100.0 g of the hydrate?
3.
A student was given a sample of hydrated Na:CrO4 (molar mass of anhydrous Na2CrO4:
162.0 g/mol). She determined the weight of the hydrated sample to be 2.58 g. After
heating the hydrate to drive off all the water of hydration, she determined the weight of
the anhydrous salt to be 1.77 g. Calculate the formula of the hydrated salt (round to the
nearest whole number of water molecules/mol).
47
A 100.0-g sample of an unknown hydrate (formula weight 234.0 g/mol) contains 31.4 g
of water (formula weight 18.02). How many moles of water are there per mole of
hydrate?
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