What is Equivalent: Definition and 1000 Discussions

Equivalent weight (also known as gram equivalent) is the mass of one equivalent, that is the mass of a given substance which will combine with or displace a fixed quantity of another substance. The equivalent weight of an element is the mass which combines with or displaces 1.008 gram of hydrogen or 8.0 grams of oxygen or 35.5 grams of chlorine. These values correspond to the atomic weight divided by the usual valence; for oxygen as example that is 16.0 g / 2 = 8.0 g.
For acid–base reactions, the equivalent weight of an acid or base is the mass which supplies or reacts with one mole of hydrogen cations (H+). For redox reactions, the equivalent weight of each reactant supplies or reacts with one mole of electrons (e−) in a redox reaction.Equivalent weight has the dimensions and units of mass, unlike atomic weight, which is dimensionless. Equivalent weights were originally determined by experiment, but (insofar as they are still used) are now derived from molar masses. Additionally, the equivalent weight of a compound can be calculated by dividing the molecular mass by the number of positive or negative electrical charges that result from the dissolution of the compound.

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  1. P

    Solving for Internal Resistance: Thenevin Equivalent Circuit Explained

    Homework Statement An automobile battery has a terminal voltage of 12.8 V with no load. When the starter motor, which draws 90 A, is running, the terminal voltage drops to 11 V. What’s the internal resistance of the battery? Homework Equations I think the solution must involve finding...
  2. I

    Norton and thevenin equivalent

    Homework Statement The circuit is attached as a jpg image. How can i find the norton equivalent when both current sources and voltage sources are present? please help Homework Equations The Attempt at a Solution
  3. M

    Which of these spring systems is equivalent?

    Hi guys. I looking at a vibrations problem with 2 springs in it (System A). I need to find an overall value for the stiffness K to find the natural frequency of the system. I know that normally when 2 springs are in series I should get the sum of (I/Ki)^-1 which would give me an equivilant...
  4. C

    Free Office Equivalents for New Laptop

    Im getting a new laptop sometime soon, the thing is that ms office is setting me back a bit. I was wondering if there are any free office equivalents that anyone here has experience with? I guess at most I'd use powerpoint and word if that's any help at all.
  5. E

    Is marginal constraints equivalent to linear constraints?

    If I have a set of Probability distributions on a product space with marginal constraints, is there any way to (how to) express the same as a linear family of PD's ( i.e. all P s.t. E_P[ f_i] =a_i for some f_i, a_i )
  6. E

    Measure theoretically equivalent

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  7. L

    Proof of Axiom of Choice equivalent.

    I'm trying to prove that the axiom of choice is equivalent to the following statement: For any set X and any function f:X\to X, there exists a function g:X\to X such that f\circ g\circ f=f. I was able to prove that the AoC implies this, but I'm having a harder time going the other...
  8. A

    How to find the equivalent Resistance of these circuits

    Suppose that all resistors have a value of 100 ohm how to find the equivalent Resistance of these circuits, the number in these circuits indicate the areas for which we will be completing calculations. how to go over thesehttp://img155.imageshack.us/img155/8421/32990280.jpg...
  9. G

    Equivalent stress in a welded part

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  10. G

    Bells inequality be satisfied with equivalent local QM?

    I've just listened to an online lecture where Susskind explained Bell's inequality () Basically he shows that classically A\cap \overline{B}+B\cap \overline{C}\geq A\cap\overline{C} Then he uses spin measurements with 0°, 45°, 90° to the z-axis for A, B, C to measure spins of an electron...
  11. C

    Find Thevenin Equivalent at A-B in Circuit

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  12. P

    Equivalent of tan(t) near Pi/2

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  13. S

    What is the Equivalent Capacitance of a Single Capacitor Setup?

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  14. R

    How Do You Solve a Norton Equivalent Circuit with a Dependent Source?

    Homework Statement See picture: http://img88.imageshack.us/img88/8319/87671967.jpg The answer is given as phasors I = 0.3536\angle45 Z = 2.828\angle-45 Homework Equations The Attempt at a Solution ZL = jwL = 2j Ohms ZC = -j/(wC) = -4j Ohms Can't do it by zeroing the sources as there's a...
  15. N

    Need help calculation Thevenin equivalent

    On the first image i have to find the thevenin equivalent viewed from terminals x, x' & y, y' i get the Req as 7.32ohms but now i am having trouble calculating the vth, i have no I to calculate thanks in advance
  16. C

    Thevenin equivalent circuit with a load

    Homework Statement Show that if a battery of fixed emf E and internal resistance R1 is connected to a variable external resistance R, the maximum power is delivered to the external resistor when R=R1 Homework Equations Power = R * I^2 The Attempt at a Solution We can think of...
  17. E

    Proof: All Blind-Memoryless search strategies are equivalent

    Hi All Is there a proof that all blind-memoryless search strategies are equivalent? By equivalent I mean that no blind-memoryless search strategy can outperform any other in terms of time to goal and domain coverage. It seems to me that this is intuitively true. How would I go about...
  18. P

    Equivalent of 1/n^(a) in the neighborhood of +infinity

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  19. C

    Equivalent Resistance Between Terminals

    What is the equivalent resistance of the circuit in Fig. P29 between terminals A and B? R1 = 5 , R2 = 5 , R3 = 5 and R4 = 1 . Note that the wires cross but do not make contact at the center. V= IRe IRe= IR1 +IR2 Series= Re= R1+R2 Parallel= 1/Re= 1/R1+R2 Re= R1R2/R1+R2 I am assuming...
  20. K

    Can Known Electric and Magnetic Fields be Used to Derive Current Sources?

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  21. Goddar

    Equivalent resistance/ geometric resistor network

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  22. O

    Engineering Resistance equivalent to a circuit

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  23. S

    3 identical resistorsgive the equivalent resistance of the circuit?

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  24. S

    Equivalent Capacitors and their charges:

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  25. C

    Refrigeration: The Equivalent Rate of Transport of Heat in Watts?

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  26. Z

    Equivalent Resistance: Finding Resistance Between Diagonally Opposite Points

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  27. D

    StackOverflow equivalent for physics?

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  28. D

    Equivalent Capacitance (Not in series or parallel)

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  29. K

    How Do You Calculate the Equivalent Capacitance of a Complex Circuit?

    Homework Statement Find the equivalent capacitance of the picture in the attachment file Homework Equations The Attempt at a Solution The circuit is neither in parallel or series. I tried breaking it up into series and parallel but it seem too easy to be correct. Any tips on solving this?
  30. Fredrik

    Equivalent definitions of continuity (topological spaces)

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  31. J

    What is the equivalent resistance and current in this parallel circuit?

    Homework Statement I need to find the equivalent resistance of the network outside the battery, and the current in resistor R2. the picture of my circuit is attached. R1= 10 ohms R2 = 6 ohms R3 = 5 ohms R4 = 30 ohms Homework Equations series Req= R1+R2... parallel 1/Req=...
  32. S

    Unraveling the Meaning of '+' Above Log: An Equivalent Expression?

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  33. D

    Does any one know what is the equivalent UL level for FMVSS 302?

    Does anyone know what is the equivalent UL level for FMVSS 302?
  34. D

    Force of car at 40mph is equivalent to bowling ball at ?

    Hi everyone, Time for me to do another demonstration for some coworkers, and I want to make sure I'm being accurate. The idea is to explain how much force a small 2000lb car moving at 40mph has, and then explain the speed that an 8lb bowling ball would need to have the same amount of force...
  35. Q

    Find Thevenin Equivalent Resistance for Network

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  36. X

    Equivalent resistance if the values of the two resistances

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  37. C

    Engineering Equivalent circuit with resistors neither in series nor parallel

    Homework Statement all resistors have arbitrary values. the equivalent resistance needs be found between terminal a and b.Homework Equations I have not got a clue how to tackle this problem. as such there is no attempted solution either.The Attempt at a Solution any help would be great. chollins
  38. S

    Equivalent expression for sinx^3

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  39. S

    Thevenin and Norton Equivalent Circuits problem

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  40. L

    Mass equivalent to one hydrogen atom?

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  41. J

    Bohmian Interpretation: Equivalent or not to Standard QM

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  42. M

    Mechanical Equivalent of Heat

    This lab involves a spool that has a crank on it and also has a string wrapped around it several times with a mass hanging on the edge of the string hanging vertically. 4.)Suppose, the cord where it is attached to the post, is under tension during the experiment. Would this lead to error in...
  43. M

    Physics Lab - Mechanical equivalent of heat

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  44. F

    Equivalent Capicitance (with a resistor)

    Hello, I came across a type question and my prof never went through it in the class and unfortunately I couldn't find it in the textbook nor on the internet. I can find the equivalent capicitance of capacitors in a combination of series/parallel no problem, however when a resistor is thrown in...
  45. Saladsamurai

    Derivation of an Equivalent Spring Constant

    Okay. I have been at this for two nights now. I want to derive, step by step, the equivalent spring constant of a Beam cantilevered at both ends with a loading at its center. Here is a schematic with A=B=L/2 Now I would like to use superposition to find the deflection at L/2 due to the...
  46. E

    How are these two proofs for the compactness of [a,b] equivalent?

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  47. J

    Conceptual Question about Equivalent Resistance

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  48. J

    Thevenin Equivalent Resistance for a Black Box

    Homework Statement I am trying to find the theoretical Thevenin equivalent resistance for a black box that I used in an experiment. The measured Thevenin equivalent resistance was roughly 4786\Omega. However, I have tried several times to solve the problem, but keep arriving at a theoretical...
  49. J

    Thevenin Equivalent Resistance for a Black Box

    Homework Statement I am trying to find the theoretical Thevenin equivalent resistance for a black box that I used in a circuits experiment. The measured Thevenin equivalent resistance was roughly 4786\Omega, so the theoretical should be somewhere around that. However, I have tried several...
  50. B

    Why Does Magnetic Hysteresis Loss Appear as a Resistance in Electrical Circuits?

    Hi Guys, :smile: Can someone please explain to me the logic behind the representation of 'Magnetic Hysteresis loss' as a resistance in electrical equivalent circuits?... will be extremely grateful. I have studied some info on this subject on the net. Even though the physics of Hysteresis...
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