Heat Capacity - forum post summary

Kirchhoff's Law (thermodynamics), change in heat capacity

Started 1 week, 1 day ago (2009-11-03 06:21:00) by pillanoid

1. The problem statement, all variables and given/known data Calculate the standard enthalpy change ( H) at 25 degrees Celsius and 927 degrees Cesius for the reaction, WCl4(g) + CH4(g) = WC(s) + 4HCl(g) Data: WCl4(g): H298 = -336 kJ/mole; Cp (heat capacity at constant pressure) = 105.6 J/mol*K HCl(g): H298 = -92.3 kJ/mole; Cp = 30.5 J/mol...

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heat capacity of metals

Started 1 week, 6 days ago (2009-10-29 05:52:00) by KitCh

A particular metallic element, M, has a heat capacity of 0.36 J*g*K, and it forms an oxide that contains 2.90 grams of M per gram of oxygen. (a) Using the law of Dulong and Petit (Cp x M = 25 J*mol*K), estimate the molar mass of the metal M [Answer: _____ g/mol] (b) From the composition of the oxide (2.90 g M/g O) and the molar mass of oxygen (16 g/mol), determine the mass of M that combines ...

Source: Chemical Forums: Chemistry Forum, Chemistry Questi...

Forum: Undergraduate General Chemistry Forum

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Specific heat capacity changing with temperature?

Started 2 weeks, 3 days ago (2009-10-25 05:47:00) by Robert P

im currently running an experiment to determine the specific heats of certain materials, unforuantely the specific heats of materials actually changes with temperature. I was wondering how does specific heat change with temperature? ive looked into a few possible ideas by einstein etc when shows what the specific heats tend to when they get very low of very high etc... but what happens if i was ...

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Two-phase Heat Capacity

Started 2 weeks, 5 days ago (2009-10-23 08:23:00) by Howy

Hi, I was woindering if anyone can help me on a problem I have been stuck on for a while now. I have an equation to combine the heat capcity of oil and water, but I cant find an equation anywhere that combines the heat capacities for water oil and gas. All i have is CpL = (qo(qo+qw))Cpo+(1-(qo/(qo+qw))Cpw Does anyone know a formula for combing...

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Forum: General Physics

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How to measure specific heat capacity of tap water using a microwave oven

Started 3 weeks ago (2009-10-21 05:58:00) by chem_is_lovex

Hi, Can someone please give me some suggestions on how to use a microwave oven to determine the specific heat capacity of tap water? This is not a homework question, but an assignment and I have absolutely no idea how I can do this.This experiment will be done at home, so please no immersion heaters or anything else that won't be used at home. thanks :)

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Forum: Introductory Physics

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Convert ml to grams for a Heat Capacity and Specific Heat problem, is that possible?

Started 3 weeks ago (2009-10-20 23:24:00) by Knight226

1. The problem statement, all variables and given/known data Is it possible to convert ml to grams for a heat Capacity and Specific Heat type of problem? The problems that I have done so far did not use ml at all. I am stuck with the following problem: A piece of stainless steel (specific heat = 0.50 J g -1 o C -1 ) is taken from an over at 178 o C and...

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Convert ml to grams for a Heat Capacity and Specific Heat problem, is that possi

Started 3 weeks ago (2009-10-20 18:06:00) by Lin

Is it possible to convert ml to grams for a Heat Capacity and Specific Heat type of problem? The problems that I have done so far did not use ml at all. I am stuck with the following problem: A piece of stainless steel (specific heat = 0.50 J g -1 o C -1 ) is taken from an over at 178 o C and immersed in 225 ml of water at 25.9 o C. The water temperature rises to 42.4 o C. What is the mass ...

Source: Chemical Forums: Chemistry Forum, Chemistry Questi...

Forum: Undergraduate General Chemistry Forum

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Proof that Heat Capacity is independent of Pressure for a new Equation of State

Started 1 month ago (2009-10-12 09:00:00) by Thyferra2680

For a gas that obeys the equation of State P(v-b) = RT, where b is a constant, show that Cp is independent of Pressure, i.e., ( Cp/ p) at constant T is equal to zero 2. Relevant equations Maxwell Relations H = U+PV dh = TdS + PdV dh/dT at constant P is defined as Cp 3. The attempt at a solution Unfortunately I can't simply ...

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Forum: Advanced Physics

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Heat Capacity

Started 1 month ago (2009-10-08 10:17:00) by DarkPhoenix

http://physicsforums.com/attachment....1&d=1255013 927 I need help for number 2(b) A student investigates the evaporation of water. He pours 100 cm3 of water into measuring cylinder A and 100 cm3 of water into measuring cylinder B. Measuring cylinder A is kept at 40 °C and B is kept at 80 °C in the same part of the laboratory. Fig. 2.1 shows the...

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Forum: Introductory Physics

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degrees of freedom affect on heat capacity ratio

Started 1 month, 1 week ago (2009-09-29 02:45:00) by jaejoon89

1. The problem statement, all variables and given/known data Why would vibrational and rotational degrees of freedom affect the heat capacity ratio more for N2 and CO2 than He or Ar? Would this occur at room temperatures? 2. Relevant equations d.o.f.: 3N vibrational d.o.f., linear molecule: 3N - 5 nonlinear: 3N - 6 3. The attempt...

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Forum: Advanced Physics

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