chemistry

First of all, you need to know how many g of Mg actually reacted in the first reaction. You can determine this by determining the limiting reactant.

The reaction is
Mg + F2 -> MgF2

16.2 g of Mg is 16.2/24.32 = 0.666 moles
25.3 g of F2 is 25.3/38.0 = 0.666 moles

So equal numbers of moles are consumed. There is no limiting reactant in this case. I should have realized this wehen the problems stated that the Mg reacts exactly with 25.3 g.

10.5 g is 64.8% of 16.2. When you have excess fluorine, you will get 64.8% as much product as you did in the first (complete) reaction. That would be 0.648 x 0.666 = 0.432 moles of MgF2. Each mole of MgF2 has a mass of 62.32 g. That means you make 26.9 g of MgF2.

I quicker way to get the answer is:
MgF2 formed = (10.5/16.2)(16.2 + 25.3), which is 64.8% of the total mass of reactants in the first (complete) reaction.

  1. 👍 0
  2. 👎 0
  3. 👁 327

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chemistry

    A mole of methane reacts with 64g of oxygen at 1 atm, 425 K. There are two ways in which methane can react with oxygen. It can either form water vapor and carbon dioxide or water vapor and carbon monoxide. After reaction the final

    asked by Natalie on November 18, 2010
  2. chemistry

    Q1) 5 liters of Butane gas (C4H10) is reacted with plenty of oxygen at 27 oC and 1 atm to produce carbon dioxide and water vapor. Calculate the following: 1- The volume of CO2 produced at 1 atm and 400 oC. 2- The mass of H2O vapor

    asked by David on November 2, 2009
  3. chem help

    The reaction of methane and oxygen yields carbon dioxide gas and water. The unbalanced reaction is as follows: CH4(g) + O2(g)CO2(g) + H2O(g) A. If 1.26 grams of methane are reacted, how many grams of water vapor are produced? B.

    asked by eve on April 13, 2009
  4. chemistry

    1)The reaction of methane and oxygen yields carbon dioxide gas and water. The unbalanced reaction is as follows: CH4(g) + O2(g)CO2(g) + H2O(g) A. If 0.718 grams of methane are reacted, how many grams of water vapor are produced?

    asked by eng on January 7, 2010
  5. Chemistry

    The overall reaction in a commercial heat pack can be represented as shown below. 4 Fe(s) + 3 O2(g) 2 Fe2O3(s) ΔH = -1652 kJ How much heat is released when 4.00 mol iron is reacted with excess O2? How much heat is released when

    asked by Anonymous on January 13, 2015
  1. chemistry

    "However, the Ag^+ + I^- reacted to give AgI (but that is not a redox reaction) and if they reacted why didn't Br^- and Ag^+?" Hi Dr.Bob, I am also given additional information for reaction #1 Cu(s) I-(aq) Ag(s) Br- (aq)

    asked by Joseph on April 15, 2008
  2. chemistry

    Consider the following reaction: 2H2 (g) + O2 (g)  2H2O (l) ΔH = -572 kJ a. How much heat is evolved for the production of 1.00 mol H2O (l)? b. How much heat is evolved when 4.03 g hydrogen is reacted with excess oxygen? c.

    asked by Anonymous on November 9, 2012
  3. chemistry

    Zinc reacts with sulphur to form zinc sulphuric 16.2g.Sample of zinc is reacted with log of sulphur(Zn=65,S=32,o=16) A)Write a chemical reaction for the reaction b)Calculate the number of moles of zinc atoms that reacted. c)Number

    asked by Anonymous on November 14, 2016
  4. Chem

    When 5.49 g of platinum reacts with an excess of fluorine, 7.65 g of platinum(_) fluoride forms. a. What is the mass of fluorine in the compound? b. Find the number of moles of platinum that reacted. c. Find the number of moles of

    asked by Lauren on September 10, 2017
  5. Chemistry (stoichiometry)

    22 moles of benzene are completely reacted with molecular oxygen, how many moles of carbon dioxide will be produced? and if 150 grams of water were produced, how many moles of oxygen must have reacted

    asked by Alex on March 1, 2016
  6. Chemistry

    A 0.879 g sample of a CaCl2 ∙ 2 H2O / K2C2O4 ∙ H2O solid salt mixture is dissolved in 150 mL of deionized water. A precipitate forms which is then filtered and dried. The mass of this precipitate is 0.284 g. The limiting

    asked by Destiny on March 7, 2019

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