Determine the enthalpy change of the following reaction: 2KClO3 -> 2KCl + 3O2 Given enthalpies:
KClO3: -391.4 kJ/mol
O2: 0 kJ/mol
KCl: -436.7 kJ/mol

A. -45.3 kJ/mol
B. 45.3 kJ/mol
C. 90.6 kJ/mol
D. -90.6 kJ/mol

The mentor is usually a peer of the individual that acts as a role model and the individual get started in adult life.

Total solidification times of three casting geometries are to be compared: a sphere, a cylinder, in which the length-to-diameter ration - 1.0, and a cube. volume = 1000 cm^3 for all three shhapes, and the same casting alloy is used. a) determine the solidification times of each geometry b) based on the results of part (a), which geometric element would make the best riser? c) if the mold constant = 3.5 min/cm^2 in chvorinov's rule, compute the total solidification time for each casting.

What changes occur in the brain during the teenage years? 25 points, someone me out!a.) thinking becomes slower as the brain grows larger. b.) connections between neurons become stronger and faster. c.) unused neurons fuse together to form larger, better functioning neurons. d.) more neurons are developed.