Newest thermodynamics Questions | Wyzant Ask An Expert

03/13/19

Do photons lose energy while travelling through space? Or why are planets closer to the sun warmer?

My train of thought was the following:The Earth orbiting the Sun is at times 5 million kilometers closer to it than others, but this is almost irrelevant to the seasons.Instead, the temperature... more

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Thermodynamics Chemistry

03/06/19

looking for minimum mass of methane?

Using a molar heat of combustion of –890 kJ/mol, The minimum mass of methane that must be burned to warm 5.64 kg of water from 21.5°C to 77.4°C, assuming no heat losses to the environment... more

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Thermodynamics Chemistry

03/05/19

finding the mass of hexane required?

Using a molar heat of combustion of hexane (C6H14) –4163 kJ/mol, the mass of hexane required to increase the temperature of 1.76 L of water from 21.0°C to 70.0°C is a.bc? g. Put your answer... more

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Thermodynamics

02/23/19

thermodynamics gas laws

1dm^3 of air at 20oC is heated at a constant pressure of 300 kPA until the volume is doubled calculate:-final temperature -the mass

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Thermodynamics Chemistry

01/29/19

Chemistry and Compression of Gas

A gas is compressed 3 L while a constant external pressure of 1.2 atm is applied. What would the total change in internal energy be if 30.2 J of heat is released from the system after the compression? more

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Thermodynamics Chemistry

01/29/19

Change in Initial Energy

Calculate the mass of ice (c= 2.11 J/gC) required to melt (initial temperature 0 Celsius) in a 500 gram sample of iced team (assume c= 4.184 J/g C since it is mostly water) to lower the temperature... more

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Thermodynamics Chemistry Hess's Law

01/24/19

What is the molar enthalpy of formation for ammonia?

Hi I'm having issues relating hess's law to this question:The given chemical equation represent the combustion of ammonia and the combustion of hydrogen 1. 4NH3+3O2-->6H2O + 2N2. ( deltaH1 =... more

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Thermodynamics Chemistry

01/15/19

Can someone help me with this question please?

CH4(g) + 2 O2(g) --> CO2(g) + 2 H2O(g) The value of ΔH° (heat of formation) is –802.4 kJ/mol. Can you explain quantitatively the origin of the difference between this value and -890.0 kJ/mol... more

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Thermodynamics

01/07/19

Consider a mixture of air and gasoline vapor in a cylinder with a piston.

The original volume is 50. cm3. If the combustion of this mixture releases 1077. J of energy, to what volume will the gases expand against a constant pressure of 655. torr if all the energy of... more

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Thermodynamics

12/19/18

If you have 20kg of water at 100°C, how much ice (in kilograms) would you have to add to that water in order to bring the temperature down to 30°C?

I tried using the equation Q=mc∆T, but I keep on running into the roadblock where I can't find ∆T of the ice (the problem doesn't state the initial temperature of the ice). Any help would be... more

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Thermodynamics

11/20/18

what is thermodynamics?

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Thermodynamics Chemistry

10/27/18

work question please help!

26 grams of N2 is placed in clyinder at 25 degrees celisus and the piston is adjusted so that the gas occupies a volume of 37.6 L. A pressure of 1.8 atm is now applied to the piston and olume... more

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Thermodynamics Chemistry Organic Chemistry

10/27/18

thermochemistry

Determine heat of formation of CCl4g, at 298K, CH4 + Cl2 --> CCl4 + 4HCl reaction's, is -397.3kJCH4= -78.4 kjHCl= -92.3Cl2 = 0I tried to do the sum of the products - reactents = -397.3 but my... more

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Thermodynamics Chemistry Physics Entropy

08/29/18

When does the entropy usually increase?

Some of the answers are below, maybe you can help by answering which one's correct? A. Molecule broken into two or more. B. Reaction results in increasing in No. Of gas moles. C. solid changes... more

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Thermodynamics Chemistry Δh

07/27/18

Calculate ΔH for the overall reaction in units of joules

A styrofoam cup calorimeter is used to determine ΔH for the acid-base reaction: CH3COOH (aq) + NaOH (aq) ⇔ NaCH3COO (aq) + H2O (l) when 25.00mL of 0.500M NaOH at 23.00°C is added to 25.00mL of... more

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Thermodynamics Vectors Physics Chemical Bond Energy

07/26/18

what is a system in chemistry

i would like to know how a chemistry student can define a system

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Thermodynamics Chemistry Temperature

07/09/18

How to determine the temperature range at which carbon can reduce iron (III) oxide to iron?

3 Fe2O3 (s) + 3 C (s) --> 4 Fe (s) + 3 CO2 (g) Is there a certain equation that is used to determine the temperature range? I have calculated the ΔHrxnº, ΔSrxnº, ΔGrxnº I'm not sure if... more

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Thermodynamics Chemistry

07/09/18

Heat capacity of the coffee cup calorimeter?

A reaction known to release 1.78kJ of heat took place in a coffee cup calorimeter containing 0.100L of solution where the temp rose by 3.65 deg. C. In a second experiment, when 50.0mL of 0.20M... more

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Thermodynamics Newton's Law

06/10/18

Thermodynamics First Law with Work and Energy

Air is compressed (in a piston cylinder device) isothermically from 100kPa, 30°C to 300kPa. On a per unit mass basis, compute:a) The amount of work that flows into the air. b) The change in energy... more

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Thermodynamics

05/14/18

At what rate of sublimation and deposition there is in the ice 173 K set at a room temperature?

A sample of dry ice (solid CO2) is cooled to 173 K and is set on a table at room temperature. At what temperature is the rate of sublimation and deposition the same? (ASSUME THAT THE PRESSURE IS AT... more

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Thermodynamics

04/23/18

What is the mass of an aluminum block that requires 361 Joules of energy to increase in temperature from 15.6 to 55.6?

i don't know how to do it

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Thermodynamics

04/16/18

How to solve this?

When an ideal gas at pressure P, temperature T and volume V is isothermally compressed to V/n, its pressure becomes Pi. If the gas is compressed adiabatically to V/n, its pressure becomes Pa. The... more

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Thermodynamics

02/21/18

How to find mass of something when given ml and molarity

Right now we're working with thermodynamics, and i don't know how to find the mass of NH4NO3 when without being given a grams. Ive been told there's 100ml and 1.0 M solution.

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Thermodynamics

02/04/18

A straight rod of length L has one of its end at the origin and at the other end L=1. if the mass is given as ax, where a is a content find the center of mass

Physics. Calculation on thermodynamics

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Thermodynamics

02/04/18

A straight rod of length L has one of its end at the origin and at the other end L=1. if the mass is given as ax, where a is a content find the center of mass

Physics. Thermodynamics

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Answers •1

Do photons lose energy while travelling through space? Or why are planets closer to the sun warmer?

looking for minimum mass of methane?

finding the mass of hexane required?

thermodynamics gas laws

Chemistry and Compression of Gas

Change in Initial Energy

What is the molar enthalpy of formation for ammonia?

Can someone help me with this question please?

Consider a mixture of air and gasoline vapor in a cylinder with a piston.

If you have 20kg of water at 100°C, how much ice (in kilograms) would you have to add to that water in order to bring the temperature down to 30°C?

what is thermodynamics?

work question please help!

thermochemistry

When does the entropy usually increase?

Calculate ΔH for the overall reaction in units of joules

what is a system in chemistry

How to determine the temperature range at which carbon can reduce iron (III) oxide to iron?

Heat capacity of the coffee cup calorimeter?

Thermodynamics First Law with Work and Energy

At what rate of sublimation and deposition there is in the ice 173 K set at a room temperature?

What is the mass of an aluminum block that requires 361 Joules of energy to increase in temperature from 15.6 to 55.6?

How to solve this?

How to find mass of something when given ml and molarity

A straight rod of length L has one of its end at the origin and at the other end L=1. if the mass is given as ax, where a is a content find the center of mass

A straight rod of length L has one of its end at the origin and at the other end L=1. if the mass is given as ax, where a is a content find the center of mass

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