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When 435 joule of heat is added to 3.4 g olive oil at 21C the temperature increases to 85C what is the specific heat capacity of the oil?
Wiki User
∙ 11y ago
Q= heat energy J
m= mass g
c= heat capacity J/(g*C)
T= temperature change C
Q=mcT
435=3.4*m*64
m=1.999
Wiki User
∙ 11y ago
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How is heating related to a substance?
As an object is heated, the rate of increase in temperature is proportional to the rate of heat added. The proportionality is called the heat capacity. Because the heat capacity is actually a function of temperature in real materials, the total amount of energy added will be equal to the integral of the heat capacity function over the interval from the initial temperature to the final temperature. If you just assume an average heat capacity over the temperature range, then the rise in temperature will be exactly proportional to the amount of heat added.
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That's kind of a trick question. Specific heat - also known as "heat capacity" is the energy required to change the temperature by a fixed amount. In the case of an isothermal process, the temperature isn't changing. Since specific heat is defined as (δH/δT), isothermal heat capacity would be (δH/δT)T which means, in English, the change in enthalpy with a change in temperature when the temperature isn't changing... you see the problem. If δT = 0, then δH/δT = ±∞ (positive if heat is added to the system to keep the temperature constant, negative if heat was removed to keep it isothermal) You could write some equations such that the heat capacity becomes a term in the equation. What you will generally find though is that the heat capacity is multiplying a dT term and when dT is zero, that term drops out and heat capacity is irrelevant for the calculation.
Is there any experiment that you can do to determine the specific heat capacity?
An immersion heater can be wired in series to a joulemeter to measure the added heat to a material. Once a certain amount of energy (Eh) had been added the temperature change was recorded (Dt) Along with the mass the equation Eh=cmDt can be used to find out c which is the specific heat capacity. Physics Class 4.5 St. Davids High School, Dalkieth, Scotland
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