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.
iPad (3rd generation) 1  Year: Early 2012. 2  Capacity: 16, 32, 64 GB. 3  Model number (on the back cover): A1416 on the iPad (3rd generation) Wi-Fi.  White or black front 1  bezel. 30-pin connector.  The micro-SIM tray is on the right side on iPad (3rd generation) Wi-Fi 1  + Cellular. FaceTime and iSight cameras.