Aboiler is producing 5000 lb/hr of steam at 150 psig and 400 °f. water is fed to the boiler at a temperature of 80 f. the boiler is operating at 80% efficiency. if the feed water is heated to 220 °f, by using a hot waste stream, % energy savings would be near to (a) 9.6 (b) 6.9 (c) 7.8 (d) 4.1

What was bohr’s contribution to the planetary model

Cryolite, na3alf6(s), an ore used in the production of aluminum, can be synthesized using aluminum oxide. start this question by first balance the chemical equation.1.) balance the equation: - alo3(s)+naoh(l)+hf(> na3alf6+h2o(g). 2.) if 17.5 kilograms of al2o3(s), 51.4 kilograms of naoh(l), and 51.4 kilograms of hf(g) react completely, how many kilograms of cryolite will be produced? 3.)which reactants will be in excess, (al2o3, naoh, or hf) 4.)what is the total mass of the excess reactants left over after the reaction is complete in kg?

Lord kelvin described the concept of absolute zero temperature and the laws relating to the change of thermal energy during chemical reactions what type of chemist would he be considered today