100 point s the approximate composition of the atmosphere is shown in the pie-chart. which statement best describes the chart? a) the chart shows the percentages of elements in a mixture. b) the chart shows the percentages of elements in a compound. c) the chart shows the percentages of pure substances in a mixture. d) the chart shows the percentages of compounds in a pure substance.

Which statement is true according to the kinetic theory? a. molecules of different gases with the same mass and temperature always have the same average density. b. molecules of different gases with the same mass and temperature always have the same average volume. c. molecules of different gases with the same mass and temperature always have the same pressure. d. molecules of different gases with the same mass and temperature always have the same molecular mass. e. molecules of different gases with the same mass and temperature always have the same average kinetic energy.