In drying casein, the dryer is found to consume 4 m 3 /h of natural gas with a calorific value of 800 kJ/mole. If the throughput of the dryer is 100 kg of wet casein per hour, drying it from 55% moisture to 10% moisture, estimate the overall thermal efficiency (percent or ratio of heat needed to heat used) of the dryer taking into account the latent heat of evaporation only. Assume that the latent heat of evaporation is 2257 kJ kg-1 (at 100 °C), and the natural gas to be at standard temperature and pressure at which 1 mole occupies 22.4 liters.

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question: ray weighs 100 kilograms, his wrestling partner, bobby, weighs 50 kilograms. if ray moves at 4 m s , how fast will bobby have to run at him to apply an equal amount of kinetic energy?

answer: 8 m/s he needs to run twice as fast to keep up so he has some work to do

explanation:   if the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

question answered by

(jacemorris04)

because of all the things that happen around the us, many people get into arguments which sadly could get physical, but we should actually make a change for that.

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.