1. Magnesium has three common isotopes: 24 Mg (78.99%), 25Mg(10.00%), 26Mg(11.01%). What is the average atomic mass of magnesium? 2. Uranium has three common isotopes. If the abundance of 234U is 0.01%, the abundance of 235U is 0.71%, and the abundance of 238U is 99.28%, what is the average atomic mass of uranium?

Write the complete balanced equation for the reaction between lead (iv) oxide (pbo2) and water (h2o).

Which statement best explains the relationship between an area is geography and the temperature of its surface water

Consider the following reaction at equilibrium. 2co2 (g) 2co (g) + o2 (g) h° = -514 kj le châtelier's principle predicts that the equilibrium partial pressure of co (g) can be maximized by carrying out the reaction a. at high temperature and high pressure b. at high temperature and low pressure c. at low temperature and low pressure d. at low temperature and high pressure e. in the presence of solid carbon