The enthalpy change that accompanies a reaction is called the enthalpy of reaction (DHrxn). It is sometimes convenient to provide the value for DHrxn along with the balanced chemical equation for a reaction (also known as a thermochemical equation): 2H2(g) + O2(g) -> 2H2O(g) DH = -483.6 kJ.
It is the most recent in 9.7 inch iPad version. The display is also Retina with a huge resolution of 2048 x 536 pixels at 264 ppi. This new iPad retained the size 9.7 inches display size(250 mm) and also the LED back-lighting technology, plus fingerprint and scratch resistant coating. Random Access Memory is also the same: 1024 MB DDR II. The 4th generation iPad has the fastest processor, called Apple A6X. CPU features a 1.4 GHz dual core.
Apple iPad Pro (9.7-inch) The 9.7-inch iPad Pro delivers an unprecedented combination of portability and performance. Powered by the A9X chip and featuring the brightest, most advanced Retina display, it's only 6.1mm thin and weighs less than a pound. $36.50/mo. to $51.50/mo.