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ONE MOLE OF AN IDEAL GAS EXPANDS TO twice its original volume in free expansion what is entropy change of gas?
In free expansion, the gas expands without doing work and without heat exchange with the surroundings. For one mole of an ideal gas expanding isothermally and reversibly from volume ( V ) to ( 2V ), the entropy change (( \Delta S )) can be calculated using the formula ( \Delta S = nR \ln\left(\frac{V_f}{V_i}\right) ). Here, ( n = 1 ) mole, ( R ) is the gas constant, and ( \frac{V_f}{V_i} = 2 ). Thus, the entropy change is ( \Delta S = R \ln(2) ).
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What is the difference between isentropic and isenthalpic expansion?
isenthalpic expansion is through PRDS or control valve where entropy changes. Whereas expansion through a steam turbine is isentropic one and enthalpy drops. isentropic expansion is more efficient process as compared to isenthalic one.
If you need to multiply the following reaction by choice to be an intimate reaction to have some small problem what will be the final value for the entropy overreaction used for the intermediate react?
To determine the final entropy change for a reaction when multiplied by a choice, you would typically apply the principle of additivity of entropy. If you multiply a reaction by a factor, the change in entropy for the overall reaction will also be multiplied by that same factor. Therefore, if you have the standard entropy change for the original reaction, you would multiply that value by the factor you used to scale the reaction to find the final entropy change for the intermediate.
Will this entropy change by positive or negative?
If the system becomes more disordered, the entropy change will be positive. If the system becomes more ordered, the entropy change will be negative.
Why iron expands on heating is considered as a physical change?
Iron expands on heating because the increased thermal energy causes its atoms to vibrate more vigorously, leading to greater distances between them. This process is reversible; when the iron cools down, it contracts back to its original size without any change in its chemical composition. Since the substance remains iron throughout the process and no new substances are formed, this expansion is classified as a physical change.
When a mercury therometer is heated the mercury expands and rises in the thin tube of glass What does this indicate about the relative rates of expansion for mercury and glass?
The fact that the mercury expands and rises in the thin glass tube when heated indicates that mercury expands more than glass when heated. This suggests that mercury has a higher coefficient of thermal expansion compared to glass.
What is the relationship between entropy and adiabatic expansion?
During adiabatic expansion, entropy remains constant. This means that as a gas expands without gaining or losing heat, its entropy does not change.
When an ideal gas expands in vacuum work done is?
When an ideal gas expands in a vacuum, no work is done because there is no external pressure against which the gas can expand. In this case, the expansion is considered to be isentropic, meaning that there is no change in entropy of the system.
When is the change in entropy zero?
The change in entropy is zero when a process is reversible, meaning that the system and surroundings return to their original state without any net change in entropy.
What is the significance of isothermal free expansion in thermodynamics?
The significance of isothermal free expansion in thermodynamics lies in its demonstration of the concept of entropy. During isothermal free expansion, a gas expands without doing any work and without any change in temperature. This process helps to illustrate how the entropy of a system increases when it undergoes spontaneous changes, providing insight into the second law of thermodynamics.
When does the change in entropy equal zero?
The change in entropy equals zero when a process is reversible, meaning that the system and surroundings return to their original state without any net change in entropy.
What is the relationship of coefficient linear expansion to actual expansion?
The coefficient of linear expansion is a constant value that quantifies how much a material expands per degree Celsius increase in temperature. The actual expansion of an object can be calculated by multiplying the coefficient of linear expansion by the original length of the object and the temperature change.
What is the difference between isentropic and isenthalpic expansion?
isenthalpic expansion is through PRDS or control valve where entropy changes. Whereas expansion through a steam turbine is isentropic one and enthalpy drops. isentropic expansion is more efficient process as compared to isenthalic one.
What three factors affect how much an object expands or contracts as its temperature changes?
The three factors are the: material properties (coefficient of thermal expansion), temperature change, and original dimensions of the object.
Which of the following describes the entropy change of a gas reaction?
If there is an increase in the number of gas molecules, then S > 0.
How does the entropy change in the reaction 2c3h6g 9o2g 6co2g 6h2og?
The entropy change in a reaction can be calculated by comparing the entropy of the products to the entropy of the reactants. Without specific entropy values provided, it is difficult to determine the exact change. However, in general, the entropy change is positive in reactions where the products have higher entropy than the reactants, indicating an increase in disorder.
Will this entropy change by positive or negative?
If the system becomes more disordered, the entropy change will be positive. If the system becomes more ordered, the entropy change will be negative.
How does the density of water change as it expands?
Since "expansion" in this case refers to the increased spacing between molecules, then the density must decrease.
