Copper has two isotopes. the one isotope (copper-63) has an abundance of 69.2% and a mass of 62.930 amu. the second isotope (copper-65) has an abundance of 30.8% and a mass of 64.928 amu. calculate the average atomic mass of copper. 62.930 amu 63.545 amu 63.929 amu 64.928 amu

Which statement accurately describes the relationship between air pressure, air density, or altitude? as altitude increases, pressure increases.as altitude increases, air density increases.air pressure and density are lowest at sea level.denser air exerts more pressure than less dense air.

If a molecule with a molecular formula of c13h18 is treated with an excess of h2 in the presence of finally divided pt metal under conditions required for maximum hydrogenation of the molecule to give a molecule with a formula c13h24, how many rings are in the molecule?

What must occur for air masses to form fronts