Chemestry

posted by .

To extract gold from its ore, the ore is treated with sodium cyanide solution in the presence of oxygen and water.
4 Au(s) + 8 NaCN(aq) + O2(g) + 2 H2O(l) 4 NaAu(CN)2(aq) + 4 NaOH(aq)

(a) Determine the mass of gold that can be extracted if 29.3 g sodium cyanide is used.

(b) If the mass of the ore from which the gold was extracted is 146.5 g, what percentage of the ore is gold?

  • Chemestry -

    You don't have an arrow. How do you know where the reactants stop and the products begin?

  • Chemestry -

    4 Au(s) + 8 NaCN(aq) + O2(g) + 2 H2O(l) --> 4 NaAu(CN)2(aq) + 4 NaOH(aq)

    oh sorry, here it is!

  • Chemestry -

    mols NaCN = grams/molar mass
    Using the coefficients in the balanced equation, convert mols NaCN to mols Au.
    Now convert mols Au to g Au. g = mols Au x atomic mass Au. This is the theoretical yield of Au.

    b.
    %yield = (actual yield/theor yield)*100 = >

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. chemistry

    use the properties of sodium cyanide described above to deduce the type of bonding that holds this compound together, explaining in 1 or 2 short sentences how you arrived at your conclusions. Write a balanced chemical equation for …
  2. chemistry

    To extract gold from its ore, the ore is treated with sodium cyanide solution in the presence of oxygen and water. 4 Au(s) + 8 NaCN(aq) + O2(g) + 2 H2O(l) 4 NaAu(CN)2(aq) + 4 NaOH(aq) Determine the mass of gold that can be extracted …
  3. chemistry

    To extract gold from its ore, the ore is treated with sodium cyanide solution in the presence of oxygen and water. 4 Au(s) + 8 NaCN(aq) + O2(g) + 2 H2O(l) 4 NaAu(CN)2(aq) + 4 NaOH(aq) Determine the mass of gold that can be extracted …
  4. chemistry

    To extract gold from its ore, the ore is treated with sodium cyanide solution in the presence of oxygen and water. 4 Au(s) + 8 NaCN(aq) + O2(g) + 2 H2O(l) 4 NaAu(CN)2(aq) + 4 NaOH(aq) Determine the mass of gold that can be extracted …
  5. Chemistry

    To extract gold from its ore, the ore is treated with sodium cyanide solution in the presence of oxygen and water. 4 Au(s) + 8 NaCN(aq) + O2(g) + 2 H2O(l) 4 NaAu(CN)2(aq) + 4 NaOH(aq) Determine the mass of gold that can be extracted …
  6. Chemistry

    To extract gold from its ore, the ore is treated with sodium cyanide solution in the presence of oxygen and water. 4 Au(s) + 8 NaCN(aq) + O2(g) + 2 H2O(l) -> 4 NaAu(CN)2(aq) + 4 NaOH(aq)
  7. Chemistry

    To extract gold from its ore, the ore is treated with sodium cyanide solution in the presence of oxygen and water. 4 Au(s) + 8 NaCN(aq) + O2(g) + 2 H2O(l) 4 NaAu(CN)2(aq) + 4 NaOH(aq) (a) Determine the mass of gold that can be extracted …
  8. CHEMISTRYYYY HELP

    A sample of gold ore contains 22.0 g of gold metal per 100kg of ore. If gold has a market value of $350.00 per oz., what mass of ore, in tons, must be refined to get one million dollars worth of pure gold?
  9. Chemestry

    To extract gold from its ore, the ore is treated with sodium cyanide solution in the presence of oxygen and water. 4 Au(s) + 8 NaCN(aq) + O2(g) + 2 H2O(l) 4 NaAu(CN)2(aq) + 4 NaOH(aq) (a) Determine the mass of gold that can be extracted …
  10. Chemestry

    To extract gold from its ore, the ore is treated with sodium cyanide solution in the presence of oxygen and water. 4 Au(s) + 8 NaCN(aq) + O2(g) + 2 H2O(l) 4 NaAu(CN)2(aq) + 4 NaOH(aq) (a) Determine the mass of gold that can be extracted …

More Similar Questions