Chemistry

7) 14 carat gold has a purity of 58.3%. How many moles of gold are in 163 grams of 14 carat gold?
Answer in units of moles.
8) A 15.9 g sample of iron ore is treated as follows. The iron in the sample is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 11.5 g. What was the mass of iron in the sample of ore?
Answer in units of g.
9) A 47.2 g of iron ore is treated as follows. The iron in the sample is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 13 grams. What was the percent iron in the sample of ore?
Answer in units of %.
10) An ore contains Fe3O4 and no other iron. The iron in a 51.5-gram sample of the ore is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 22.3 g. What was the mass of Fe3O4 in the sample of ore?
Answer in units of g.

  1. 👍
  2. 👎
  3. 👁
  1. 7) 14 carat gold has a purity of 58.3%. How many moles of gold are in 163 grams of 14 carat gold?
    Answer in units of moles.
    g Au = 163 x 0.583 = ?
    mols Au = g/atomic mass = ?


    8) A 15.9 g sample of iron ore is treated as follows. The iron in the sample is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 11.5 g. What was the mass of iron in the sample of ore?
    Answer in units of g.
    11.5 g Fe2O3 x (2*atomic mass Fe/molar mass Fe2O3) = ?

    9) A 47.2 g sample of iron ore is treated as follows. The iron in the sample is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 13 grams. What was the percent iron in the sample of ore?
    Answer in units of %.
    Follow the above to find grams Fe in the sample. Then % Fe = (g Fe/mass sample)*100 = ?

    10) An ore contains Fe3O4 and no other iron. The iron in a 51.5-gram sample of the ore is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 22.3 g. What was the mass of Fe3O4 in the sample of ore?
    Answer in units of g.
    Follow same procedure as #8. The factor to use is (2*molar mass Fe3O4/3*molar mass Fe2O3)

    Post your work if you have further questions.

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. English

    Which accurately describes the experience of gold seeker traveling to the Klondike? a. most gold seekers travel the whole distance by water b. about half of the gold seekers complete the journey to the Klondike*** c. all gold

  2. chemistry

    Treatment of gold metal with BrF3 and KF produces Br2 and KAuF4, a salt of gold. Find the mass of the gold salt that forms when a 73.0 -g mixture of equal masses of all three reactants is prepared.

  3. Chemistry

    How many moles of gold atoms do 3.45 x 10^24 gold atoms constitute. This is what I did 3.45 x 10^24 x 1 / 6.022 x 10^23 = 573 am I right

  4. Social Studies

    Why were Kushites so eager to trade their gold for Egypt's grain? A. They did not have enough land to farm and needed food more than gold.** B. They worshiped grain as a god and so preferred it more than gold. C. They were afraid

  1. algebra

    A goldsmith has two gold alloys. The first alloy is 30% gold; the second alloy is 80% gold. How many grams of each should be mixed to produce 10 grams of an alloy that is 40% gold? amount of 30% gold ___ g amount of 80% gold ___ g

  2. English HELP

    In the pardoner's tale, what is ironic about the rioters discovery of gold in the place where they were looking for death? A) They do not realize that the gold actually belongs to Death B) It makes them realize that Death is not

  3. Chemistry

    A current of 45A is passed through a solution of gold salt for 1 hour 45 minutes calculate (a) the mass of gold deposited (b) the numbers of moles of gold deposited (c) if the same current is used, find the time taken for 5.5g of

  4. math

    shanon needs 20g of 80% of gold to make a pendan. she has some 85% gold and some 70% gold, from broken jewelry and wants to know how much she should use. determine the quantity of each alloy that she should use.

  1. Chemistry

    An atom of gold has a mass of 3.271 times 10^-22g. How many atoms of gold are in 5.00g of gold?

  2. CHEMISTRY

    Determine the solvent and solute in the following : a) carat 14 gold b) gaseous drinking ( pepsi for ex.)

  3. physics

    4. What is the electric potential at the surface of a gold atom’s nucleus, which is assumed to be spherical? The radius of a gold nucleus is 6.6 x 10-15 meters and the atomic number of gold is 79.

  4. Math

    To find the weight of the gold in a 22 karat gold object, multiply the object's weight by 0.917. To find the weight of gold in a 14 karat gold object, multiply the object's weight by 0.583. Part 1 Which contains more gold, a 22

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