When lead (II) nitrate is heated, one of the products is a brown gas. a).Write the equation of the reaction that occurs. b).If 0.290 dm^3 of the brown gas was produced; calculate the mass of the lead (II) nitrate that was heated. (R.F.M lead (II) nitrate =331; Molar gas volume = 24dm^3 ). (KCSE 2011 paper 1 question 7).