A sample of 9.736 g of a lead oxide is reduced completely with excess carbon monoxide to give metall — Stoichiometry Chemistry Question

A sample of 9.736 g of a lead oxide is reduced completely with excess carbon monoxide to give metallic lead. The resulting gas is bubbled into saturated lime water, resulting in the precipitation of 6.636 g calcium carbonate (M = 100.09) after drying. What is the formula of this lead oxide?