Children's toys and jewelry were assessed for their contamination by potentially toxic elements (PTE). This includes traces of As (74.92 g/mol), Cd (112.4 g/mol), Pb (207.2 g/mol), and Zn (65.39 g/mol) among others. The concentrations of these PTEs were determined to characterize the subsequent health risks, and to possibly reinforce better legislation on the manufacturing of these products. A. If 365 ppb of Cd was observed, what is its equivalent in %(w/w)? B. A sample of plastic toy was treated resulting to a 1000 mL solution. What is the concentration of As in ppm if 65 ug of As is found in the sample? C. A 250 mL stock solution of 1.5 M Pb standard was prepared. What volume (in mL) of Pb stock solution must you use to prepare 50 mL of 0.15 M Pb solution? D. If the treatment used HNO3 (p = 1.51 g/mL) as the solvent during dissolution, and the density of Zn is 7.1 g/mL, what is the concentration of Zn in molality if the amount of Zn found in a 250 mL solution was 48 mg?
Children's toys and jewelry were assessed for their contamination by potentially toxic elements (PTE). This includes traces of As (74.92 g/mol), Cd (112.4 g/mol), Pb (207.2 g/mol), and Zn (65.39 g/mol) among others. The concentrations of these PTEs were determined to characterize the subsequent health risks, and to possibly reinforce better legislation on the manufacturing of these products. A. If 365 ppb of Cd was observed, what is its equivalent in %(w/w)? B. A sample of plastic toy was treated resulting to a 1000 mL solution. What is the concentration of As in ppm if 65 ug of As is found in the sample? C. A 250 mL stock solution of 1.5 M Pb standard was prepared. What volume (in mL) of Pb stock solution must you use to prepare 50 mL of 0.15 M Pb solution? D. If the treatment used HNO3 (p = 1.51 g/mL) as the solvent during dissolution, and the density of Zn is 7.1 g/mL, what is the concentration of Zn in molality if the amount of Zn found in a 250 mL solution was 48 mg?
Chemistry & Chemical Reactivity
10th Edition
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter25: Nuclear Chemistry
Section25.5: Artifical Nuclear Reactions
Problem 25.8CYU
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Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
Question
Children's toys and jewelry were assessed for their contamination by potentially toxic elements (PTE). This
includes traces of As (74.92 g/mol), Cd (112.4 g/mol), Pb (207.2 g/mol), and Zn (65.39 g/mol) among others.
The concentrations of these PTEs were determined to characterize the subsequent health risks, and to
possibly reinforce better legislation on the manufacturing of these products.
A. If 365 ppb of Cd was observed, what is its equivalent in %(w/w)?
B. A sample of plastic toy was treated resulting to a 1000 mL solution. What is the concentration of As
in ppm if 65 ug of As is found in the sample?
C. A 250 mL stock solution of 1.5 M Pb standard was prepared. What volume (in mL) of Pb stock
solution must you use to prepare 50 mL of 0.15 M Pb solution?
D. If the treatment used HNO3 (p = 1.51 g/mL) as the solvent during dissolution, and the density of Zn
is 7.1 g/mL, what is the concentration of Zn in molality if the amount of Zn found in a 250 mL
solution was 48 mg?
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