Lead can be prepared from galena [lead(II) sulfide] by first roasting the galena in oxygen gas to form lead(II) oxide and sulfur
dioxide. Heating the metal oxide with more galena forms the molten metal and more sulfur dioxide. (a) Write a balanced equation for each step, including the state of each chemical.
(1)
(2)
(b) Write an overall balanced equation for the process, including the state of each chemical.