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mart [117]
3 years ago
13

Which of the following best defines the internal energy of a system?

Chemistry
1 answer:
Anarel [89]3 years ago
7 0
 <span>In thermodynamics, the internal energy of a thermodynamic system, or a body with well-defined boundaries, denoted by U, or sometimes E, is the total of the kinetic energy due to the motion of molecules (translational, rotational, vibrational) and the potential energy associated with the vibrational and electric energy of atoms within molecules or crystals. It includes the energy in all the chemical bonds, and the energy of the free, conduction electrons in metals.</span>
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If is found that 24.68 mL of .1165 M NaOH is needed to titrate .2931 g of an unknown acid to the phenolphthalein end point. Calc
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\text{Moles of solute}={\text{Molarity of the solution}}\times{\text{Volume of solution (in L)}}  

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Volume of NaOH solution = 24.68 mL = 0.02468 L

Putting values in equation 1, we get:

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Mass of acid=gram equivalents\times {\text {Equivalent mass}}

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{\text {Equivalent mass}}=83.16g

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