Chemistry, 04.05.2020 23:50 amanditafarinap3bw7g
Which substance would require 511 cal of heat to raise the temperature of a 125 g sample from 22.5°C to 68.8°C?
A. aluminum
B. brass
C. copper
D. platinum
Answers: 1
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Consider the reduction reactions and their equilibrium constants. cu+(aq)+e−↽−−⇀cu(s)pb2+(aq)+2e−↽−−⇀pb(s)fe3+(aq)+3e−↽−−⇀fe(=6.2×108=4.0×10−5=9.3×10−3 cu + ( aq ) + e − ↽ − − ⇀ cu ( s ) k =6.2× 10 8 pb 2 + ( aq ) +2 e − ↽ − − ⇀ pb ( s ) k =4.0× 10 − 5 fe 3 + ( aq ) +3 e − ↽ − − ⇀ fe ( s ) k =9.3× 10 − 3 arrange these ions from strongest to weakest oxidizing agent.
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Which substance would require 511 cal of heat to raise the temperature of a 125 g sample from 22.5°C...
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