Students are given the following data for determining the average atomic mass of Lithium: A sample of Lithium consists of 400 atoms:

30 atoms are the isotope Lithium-6 (6.015 amu)

370 atoms are the isotope Lithium-7 (7.016 amu).

Which student correctly calculated the correct average atomic mass of Lithium and why?

The equation below shows the reaction of zinc with hydrochloric acid (hcl). zn (s) + 2 hcl (aq) —> zncl2 (aq) + h2 (g) what will happen if the concentration of hcl is decreased? a. more zncl2 will be produced. b. the reaction rate will slow down. c. the hydrochloric acid will become more acidic. d. the reaction will produce water instead of hydrogen gas.