A2 m x 1.5 m section of wall of an industrial furnace burning natural gas is not insulated, and the temperature at the outer surface of this section is measured to be 80°c. the temperature of the furnace room is 30°c, and the combined convection and radiation heat transfer coefficient at the surface of the outer furnace is 10 wm2.°c. it is proposed to insulate this section of the furnace wall with glass wool insulation (k 0.038 wm c) in order to reduce the heat loss by 90%. assuming the outer surface temperature of the metal section still remains at about 80°c, determine the thickness of the insulation that needs to be used

answer: the value of enthalpy change will be -152.80 kj.

solution:

pressure = 1atm , temperature = = 298 k

given that pressure and temperature are same in both gases , the number of moles of both gases can be determined by the ideal gas equation.

according to reaction 3 moles no are reacting with 1 mol of ,then 0.49 mol of no will react with moles of ozone that is 0.16 moles of ozone. since, no is limiting reagent and is an excessive reagent.

enthalpy change for the reaction between the given volumes of the gases is :

the dissociation of nickel hydroxide is follows:

the concentration of hydroxide ion is

the equilibrium constant value of nickel hydroxide is = 6.1 * 10^-^1^6 and thus equilibrium equation can be written as:

thus, concentration of ni is 0.23 * 10^-^4 mol /l

answer: gold foil experiment - he shot alpha particles at a gold foil

explanation: