1)Calculate the amount of heat produced when 52.4g of Ca(OH)2 forms from: CaO(s) + H2O(l) —> Ca(OH)2(s) change in H = -65.2 kJ 2)Calculate the amount of heat produced when 52.4 g of CH4,
burns in an excess of air, according to the following equation:
CH4(g) + 2O2(g) → CO2(g) + 2H2O(1) + 890.2 kJ

Because potassium is 1+ and iodine is 1- making it electrically neutralhoped i   can i get brainliest

Answer is:     molar solubility of  yttrium fluorid is 4.23·10⁻⁶ m. balanced chemical reaction: yf₃(s)  → y³⁺(aq) + 3f⁻(aq). ksp = 8.62·10⁻²¹. ksp = [y³⁺]  · [f⁻]³.[y³⁺] = [yf₃] = s.[f⁻] = 3[yf₃] = 3s.ksp(yf₃)  = s  · (3s)³.8.62·10⁻²¹ = 27s⁴.s(yf₃)  =  ⁴√(8.62·10⁻²¹  ÷ 27).s(yf₃)  = 0.00000423 m.s(yf₃) = 4.23·10⁻⁶ m.