Use the table below to calculate the atomic mass of element X. Round the answer to two decimal places. Then use the periodic table to identify the element. Isotope Mass (amu) Percent Abundance 28X 27.981 92.21% 29X 28.980 4.70 % 30X 29.969 3.09%

0.2348 grams of pbcl2 used to form 44.0 ml of solution.

Displacement is the slope of a velocity vs. time graph a. true b. false

Why does earth rotate? because earth is formed from cold gases collapsing due to gravity because the matter in the nebula that formed earth was spinning because earth forms more than 99% of the mass of the solar system because the hydrogen atoms inside the nebula fused to form helium