Question

please help me solve and show work for BOTH part A and B. thank you so much

Consider the thermochemical equation below. 4Na(s) + O2(g) → 2 Na2O(s) AH = -828 kJ/mol A. Which reactant is the limiting reactant if 30.0 g of sodium is reacted with 12.0 L of oxygen gas at 1525 torr and 285 K? You must explain how you determined the limiting reactant for full credit (10 points) Answer: Na is the limiting reactant (Explanation omitted) Study guide: Identify the limiting reactant. Use the ideal gas equation to determine the pressure, volume, moles, or temperature of a gas given all other values. PV = nRT Use the ideal gas equation in stoichiometric calculations. B. How much heat is evolved, in kJ, when 30.0 g of sodium is reacted with 12.0 L of oxygen gas at 1525 torr and 285 K? (6 points) Study guide: Calculate the enthalpy change of reaction and understand how it depends upon stoichiometric amounts of reactants and products. -270. k) or 270 k) of heat is evolved

Answer 1

Solution:- Given balance chemical Reaction:- 4nq (s) + O2(g) → 2N9,0 (s) AH = -828 kJ/mol Parta Mass of N9 = 30.09 volume of O2 = 12.02 presswa (P) = 1525 torr or 2.006 atm 1 atm = 760 torr Temperatwu (T) = 285k According to ideal gas equation PV = nRT or ne pv . Put all values in formulas n = 2.00 6 cetin x 12.0% 0.0821/alm.mor. p#x285K RT h=1028 mole. molare mass of N9 - 23 Imole. so mole of NQ = 30.09 4. 23.0lmála =) 1.304 mole. According to balance chemicow Reaction 4 mole Nq º react with 1 mole Oz: So 1 mole Ng React with la moler Oy So 11304 mole Ng React with 1.304XL mole = 0.326 mole O₂ But Here 1,028 mole of Oz is present which in excess, so limiting Reactant is ng. Limiting Reactant is na. Part-B According to balance chemical Reaction:- 4 mole Na React with React with Imole o, Imole on then then -828 KJ or 828 KJ of heat is evolved i mole Ng React with Smole Oz then - 828 KT OF 828 kJ of heat is evolved 50 1.304 mole Ng React with 1.304 mole oz then emu. gas evolved -328KJ_X1.304 mole mole 4 4 > -269.928KJ 3-270 kJ AH= .-270 kJ or 270 kJ of heat is evolved.