Chemistry

Given the balanced equation representing a reaction : 2Fe+ 3Cu^2+ --> 2Fe^3+ +3Cu
When the iron atoms lose six moles of electrons, how many moles of electrons are gained by the copper ions?
(1) 12 moles
(2) 2 moles
(3) 3 moles
(4) 6 moles

how would i even start solving a problem like this?

  1. 👍
  2. 👎
  3. 👁
  1. It isn't a hard question if you remember that in a balanced equation the number of mols electrons lost ALWAYS equals the mols gained.
    There is a second but more work way of doing it like this.
    Oxidation state Fe on the left is 0. On the right is +6 (2*3+ = 6+) and going from 0 to 6+ Fe must have lost 6e.

    Cu on the left is 6+ (3*2+= 6). On the right Cu is 0. Going from 6+ to 0 Cu must have gained 6e.
    How 'bout that?

    1. 👍
    2. 👎
  2. thanks so much. so you would always count up the oxidation states and see how much one side needs to equal the other?

    1. 👍
    2. 👎
  3. That's right. In fact that is the whole concept behind balancing redox equations. You count up the electrons lost from one side to the other; count up electrons gained from one side to the other, then multiply by whatever numbers you need to make electrons gained equal electrons lost. That MAKES the reduction and oxidation parts balance and with those numbers in the bank so to speak you can easily balance the non-redox portion.

    In addition, for this problem, they already tell you how many were lost so you don't even need to count them up. You know straight away that is 6 gained.

    1. 👍
    2. 👎
  4. now I understand. thank you (:

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chemistry

    In the recovery of iron from iron ore, the reduction of the ore is actually accomplished by reactions involving carbon monoxide. Use the following thermochemical equations, Fe2O2(s) + 3CO(g) ---> 2Fe(s) +3CO2(g) ΔH° = -28kJ

  2. chemistry

    Fe2O3(s)+3CO(g)→2Fe(s)+3CO2(g) The reaction mixture initially contains 22.55 g Fe2O3 and 14.78 g CO. Determine the limiting reactant and the theoretical yield of Iron.

  3. Chemistry

    According to the following reaction, how many grams of iron(III) chloride will be formed upon the complete reaction of 27.1 grams of chlorine gas with excess iron? The balanced eq is 2Fe+3Cl2=2FeCl3 Here is my worked out equation:

  4. chemistry 2

    the balanced equation for the reduction of iron ore to the metal using CO is Fe2O3+3CO(g) -> 2Fe+3CO so what is the maximum of iron in grams that can bbe obtained from 454g (1.00 lb) of iron (III) oxide? AND what mass of CO is

  1. Chemistry

    check answer please 10. 2 Ca3(PO4)2(s) + 6 SiO2(g) + 10 C(s) ---> P4(s) + 6 CaSiO3(s) + 10 CO(g) If 39.3 g of Ca3(PO4)2, 24.4 g of SiO2 and 8.00g of C are available, find the limiting reagent. n Ca3(PO4)2= 0.127 moles n SiO2=

  2. chemistry

    Can some one please balance this equation for me Fe + O2---> Fe2O3. Fe + O2 ==> Fe2O3. Here is the way to balance these equations by inspection, meaning, by trial and error. Rule #1. You may not change any subscripts. Equations

  3. Chemistry

    When 84.8 g of iron(III) oxide reacts with an excess of carbon monoxide, iron is produced. Fe2O3(s) + 3CO(g) ==> 2Fe(s) + 3CO2(g) what is the theoretical yield of iron?

  4. Chemistry

    For a particular redox reaction NO is oxidized to NO3^- and Cu^2+ is reduced to Cu^+ . Complete and balance the equation for this reaction in basic solution. We are given this as a guide to start NO + Cu^2+ --> NO3^- + Cu^+ I

  1. Chemistry

    Fe2O3(s) + 2Al(s)-> 2Fe(l) + Al2O3(s) What is the theoretical yield of iron if we begin the reaction with 10.5 g of Al (assume an excess of Fe2O3)

  2. Chemistry

    In dilute nitric acid, HNO3, copper metal dissolves according to the following equation: 3Cu(s) + 8HNO3(aq) ----> 3Cu(NO3)2(aq) + 2NO(g) + 4H2O(aq) How many Liters of NO are formed from 5.78 x 1024 molecules of HNO3

  3. Chemistry

    Copper metal reacts with concentrated nitric acid according to the following balanced equation: 3Cu(s) + 8HNO3(aq) ¨ 3Cu(NO3)2(s) + 2NO(g) + 4H2O(l) Calculate the mass in grams of the excess reagent remaining after the complete

  4. chemistry

    What is the entropy change associated with the chemical reaction that occurs when iron oxide is converted to its metal form? Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(g) A. Zero B. Positive C. Negative D. Cannot be determined I think

You can view more similar questions or ask a new question.