Determine the mass of gold that can be extracted if 25.0g of sodium cyanide is used.

Question

4Au+8NaCN+O2--->4NaAu(CN)2+4NaOH

Answer 1

Convert 25.00 g NaCN to moles. moles = grams/molar mass.

Using the coefficients in the balanced equation, convert moles NaCN to moles Au.

Now convert moles Au to grams. g = moles x molar mass.