Gallium has an orthorhombic structure with a=0.45258nm b=0.45186nm and c=0. 76570nm the atomic radius is 0.1218nm the density is 5.904mg. m-3 and atomic weight is 69.72g. mol determine the number of atoms in each unit cell

Athin walled concentric tube exchanger is used to cool engine oil from 160°c to 60°c with water that is available at 25°c acting as a coolant. the oil and water flow rates are each at 2 kg/s, and the diameter of the inner tube is 0.5 m and the corresponding value of the overall heat transfer coefficient is 250 w/m2. oc. how long must the heat exchanger be to accomplish the desired cooling? cpwater=4.187 kj/kg-candcpengine el=2.035 kj/kg·°c, oil . 120]