Determine the partial pressure of oxygen collected over water if the temperature is 28 o C and the total pressure is 98.7 kPa.

In which layer of earth do most earthauakes occur a_ inner core b_outer core c_mantle d_crust

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.

Given the following at 25c calculate delta hf for hcn (g) at 25c. 2nh3 (g) +3o2 (g) + 2ch4 (g) > 2hcn (g) + 6h2o (g) delta h rxn= -870.8 kj. delta hf=-80.3 kj/mol for nh3 (g), -74.6 kj/mol for ch4, and -241.8 kj/mol for h2o (g)