To extract gold from its ore, the ore is treated with sodium cyanide solution in the presence of oxygen and water. 4Au(s) + 8NaCN(aq) + O 2 (g) + 2 H 2 O(l) 4NaAu(CN ) 2 (aq) + 4NaOH(aq) a. Determine the mass of gold that can be extracted if 25.0 g of sodium cyanide is used. b. If the mass of the ore from which the gold was extracted is 150.0 g, what percentage of the ore is gold?
CEM 141 Lecture 36: Temperature part 2 Dr. Jian Hu th November 30 , 2016 Temperature At the same temperature, if the molar mass of the gas increases, what happens to the average velocity it decreases We don’t smell something as quickly because molecules collide with each other and don’t move in a straight line Brownian Motion Energy of motion – kinetic energy: normally associated with translation (there are other forms of movement that are more important for more complex materials such as rotation and vibration) Phase Translation Rotation Vibration Gas Free Free Free Liquid Restricted Less