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What mass of mercury would require 65 point 5 J of energy to raise the temperature of 20C to 100C The specific heat of mercury is point 140 JgC?
Bobbernip
5.85 g
We have to use Q = m s @
Q - heat energy in joule ie 65.5 J
s - specific heat capacity ie 0.140 J/g/C
@ = @2 - @1 = 100 - 20 = 80 C
Just plug and you get the above 5.85 g nearly
Add:
Q = m•C•Δt, where Q is heat added, m is mass in grams, C is specific heat, and Δt is change in temperature.
Known:
Q = 65.5 Joules
C = 0.140 J/g•oC
Δt = 100oC-20oC = 80oC
Unknown: mass of mercury in grams
Solution
m = Q/C•Δt
m = 65.5 J/(0.140 J/g•oC)(80oC) = 6 grams (rounded to 1 significant figure)
Wiki User
∙ 11y ago
The specific heat capacity is given as 0.140 J/g°C, which means it takes 0.140 J of energy to raise the temperature of 1 g of Mercury by 1°C. To determine the mass of mercury requiring 65.5 J to increase from 20°C to 100°C, you divide the energy by the specific heat capacity: 65.5 J / 0.140 J/g°C = 467.8 g. Therefore, 467.8 g of mercury is needed.
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