A breathing mixture used by deep sea divers contains helium oxygen and carbon dioxide. What is the partial pressure of oxygen if the total pressure of the gaseous mixture is 100.9kPa? The partial pressures for He and CO2 are 81.2 KPa and 0.5 KPa, respectfully.

What is the composition, in atom percent, of an alloy that consists of 4.5 wt% pb and 95.5 wt% sn? the atomic weights for pb and sn are 207.19 g/mol and 118.71 g/mol, respectively.(a) 2.6 at% pb and 97.4 at% sn(b) 7.6 at% pb and 92.4 at% sn(c)97.4 at% pb and 2.6 at% sn(d) 92.4 at% pb and 7.6 at% sn

What’s a special glass that most beakers are made of

  the mississippians were considered to be  horticulturalists, which means they were