A furnace is fired with coal with the following analysis: 36.3% VCM, 49.6% FC, 10.7% ash, 3.4% M, 1.2%N and 5.1% S. Its heating value is 29.5 MJ/kg. Analysis of the wetted refuse shows 12% C, 65% ash and 23% H2O. Dry air is supplied at 27⁰C and 1 atm. The stack gases leave at 350⁰C, 745 mm Hg with a partial Orsat analysis of 8.71% CO2, 1.74% CO and 0.35% H2. Calculate a. % excess O2 b. Complete orsat analysis of stack gas c. m3 stack gas/kg coal (Round off to 4 decimals)

Saturated ammonia vapor at 25°C condenses on the outside surface of 16 thin-walled tubes, 2.5 cm in diameter, arranged horizontally in a 4 × 4 square array. Cooling water enters the tubes at 14°C at an average velocity of 2 m/s and exits at 17°C. Calculate (a) the rate of NH3 condensation, (b) the overall heat transfer coefficient, and (c) the tube length.  

Material Science please help

A fully charged battery contains 0.02 kmol Ag₂O (silver oxide) and 0.02 kmol Zn (zinc). The battery is initially at a temperature of 21°C. The fully charged battery is then discharged for half an hour under adiabatic conditions (no heat leaves the system). During the half hour of being discharged, the electric current from the battery does 200 kJ of work external to the battery system (none of this external work heats the battery). During this half hour, 0.001 kmol of both reactants are consumed in the net cell discharge reaction: Please see the following table for heat capacities and heats of formation. The heats of formation below show the amount of energy (kJ) needed to form one kmole of each component. If the heat of formation is negative, then forming that species releases energy (to do work or provide heat). Therefore, to create one kmole of silver oxide 29000 kJ energy is released and is generated in the battery (for work or heat), and if one kmole of silver oxide decomposes…