Chemistry by OpenStax (2015-05-04)
1st Edition
ISBN: 9781938168390
Author: Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Publisher: OpenStax
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Textbook Question
Chapter 3, Problem 28E
One 55-gram serving of a particular cereal supplies 270 mg of sodium, 11% of the recommended daily allowance. How many moles and atoms of sodium are in the recommended daily allowance?
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4. Two engineers are serving as trainees in a laboratory of a pharmaceutical company. One of their tasks involves
determining the identity of a vitamin they were given by using any equipment or method at their disposal. As a hint, their
supervisor gave them a list of possible candidates for the vitamins identity which includes:
Vitamin
Molecular Formula
Folinic Acid
C20 H23 N707
C3H11NO3
C,H,N20
C17H20N406
Pyridoxine
Niacinamide
Riboflavin
To identify the vitamins identity, the two trainees separated their sample into two equal portions and performed two
separate tests:
[a.] Engr. Mayo used the flame atomic absorption spectrophotometer in order to identify the elemental composition of the
sample which happens to be 59.0% C, 5.0% H and 22.9% N by mass
[b.] Engr. Busog on the other hand mixed his 3.88 g sample with 30.0 mL of nitrobenzene, C,H5NO2 (Latent Heat of
Fusion = 79.81 J/g). Using Beckmann's method, he determined the freezing point depression to be 7.1 deg C.
Based on the tests…
How many grams of Pb2+ are presented in 2.65 grams of lead (II) nitrate?
How many grams of lead (II) nitrate contain 3.82 grams of Pb2+?
Chapter 3 Solutions
Chemistry by OpenStax (2015-05-04)
Ch. 3 - What is the total mass (amu) of carbon in each of...Ch. 3 - What is the total mass of hydrogen in each of the...Ch. 3 - Calculate the molecular or formula mass of each of...Ch. 3 - Determine the molecular mass of the following...Ch. 3 - Determine the molecular mass of the following...Ch. 3 - Which molecule has a molecular mass of 28.05 amu?Ch. 3 - Write a sentence that describes how to determine...Ch. 3 - Compare 1 mole of H2, 1 mole of O2, and 1 mole of...Ch. 3 - Which contains the greatest mass of oxygen: 0.75...Ch. 3 - Which contains the greatest number of moles of...
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