Asked by Olivia Galvan on Apr 27, 2024
Verified
How much heat is evolved when a 35.0 g sample of copper increases from 25.0ºC to 35.5ºC?
A) 472.0 J
B) 139.7 J
C) 262.5 J
D) 13.3 J
Copper
A reddish-brown, ductile, malleable metallic element that is an excellent conductor of heat and electricity and is widely used in electrical wiring and coinage.
- Apply principles of calorimetry to calculate the heat involved in temperature changes of different materials.
Verified Answer
SB
Sarrah BishopMay 01, 2024
Final Answer :
B
Explanation :
The heat evolved can be calculated using the formula q=mcΔTq = mc\Delta Tq=mcΔT , where qqq is the heat evolved, mmm is the mass of the substance, ccc is the specific heat capacity of the substance, and ΔT\Delta TΔT is the change in temperature. For copper, c=0.385 J/g∘Cc = 0.385 \, \text{J/g}^\circ\text{C}c=0.385J/g∘C , m=35.0 gm = 35.0 \, \text{g}m=35.0g , and ΔT=35.5∘C−25.0∘C=10.5∘C\Delta T = 35.5^\circ\text{C} - 25.0^\circ\text{C} = 10.5^\circ\text{C}ΔT=35.5∘C−25.0∘C=10.5∘C . Thus, q=35.0 g×0.385 J/g∘C×10.5∘C=139.7 Jq = 35.0 \, \text{g} \times 0.385 \, \text{J/g}^\circ\text{C} \times 10.5^\circ\text{C} = 139.7 \, \text{J}q=35.0g×0.385J/g∘C×10.5∘C=139.7J .
Learning Objectives
- Apply principles of calorimetry to calculate the heat involved in temperature changes of different materials.