Element X has 3 natural isotopes. One has a mass of 11.99 amu and a relative abundance of 15.56%, the next has a mass of 10.89 amu and a relative abundance of 41.24%, and
the last has a mass of 12.25 amu and a relative abundance of 43.20%. Calculate the
average atomic mass.

Which of the following is not a result when a change to an equilibrium system is applied? (2 points) increasing the rate of the forward reaction will cause a shift to the left. increasing the rate of the reverse reaction will cause a shift to the left. decreasing the rate of the forward reaction will cause a shift to the left. decreasing the rate of the reverse reaction will cause a shift to the right.