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.

here is table 2-2:

country

percent of eligible voters that voted

rank

united states

44.9%

138

canada

60.1%

107

costa rica

84.6%

14

hungary

66.9%

82

japan

57.0%

118

egypt

27.7%

159

south africa

85.5%

10

ans is no, the data set cannot be plotted as a single circle graph

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.