Q. The bond dissociation energies of X, Y, and XY are in the ratio of 1: 0.5 : 1. ∆H for the formation of XY is -200 kJ mol-1. The bond dissociation energy of X, will be. (1) 200 kJ mol-1
(2) 100 kJ mol-1
(3) 400 kJ mol-1
(4) 800 kJ mol-1

Abike rider starts from rest and accelerates 28.0 meters down a slope in 5.00 seconds. what is her acceleration? select one: a. 3.21 m/sec2 b. 1.75 m/sec2 c. 9.80 m/sec2 d. 2.24 m/sec2

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.