Phosphorus has 23 known isotopes,only one of which is stable. Assume that phosphorus exists naturally as 97.02% p-31 and 2.98% p-30. Determine the average atomic mass of phosphorus, rounded to 2 decimals

Extra Credit Questions for Chapter Two 1- How many phosphorus atoms are contained in 158 kg of phosphorus? 2- Calculate the mass (in ng) of 2.33 x 1020 atoms of oxygen. 3- Gallium has an atomic mass of 69.723 amu. The Ga-69 (68.926 amu) is 60.11%. What is the amu of the other isotope? 4-Determine the volume of hexane that contains 5.33 × 1022 molecules of hexane. The density of hexane is 0.6548 g/mL and its molar mass is 86.17 g/mol. 5- How many sodium ions are contained in 99.6 mg of Na2SO3? The molar mass of NazS03 is 126.05 g/mol. Calculate the atomic mass of element "X", if it has 2 naturally occurring isotopes with the following masses and natural abundances: K-45 -47 44.8776 amu 46.9443 amu 32.88% 67.12%

Determine the name for P4O10. phosphorus (IV) oxide phosphorus oxide diphosphorus pentoxide tetraphosphorus decoxide phosphorus (II) oxide