45
45well there is an exact answer so i would say most of it because the air is full of oxgen and there is lots of trees
it is 77
45well there is an exact answer so i would say most of it because the air is full of oxgen and there is lots of trees
Oxygen
Oxygen
Oxygen comprises about 47% by weight of Earth's crust
Atomic percent is based on the number of atoms in a sample. So if the sample has x number of oxygen atoms and x number of iron atoms it would report 50% oxygen and 50% iron (atomic percent). Weight percent is based on the mass of the elements detected. So if we used the above example and reported the results as weight percent we would get 22.3% oxygen and 77.7% iron. Weight percent takes into consideration the mass or atomic weight of the elements and not just the number of atoms. Most people use weight percent although for chemistry atomic percent may be more useful.
Cow
obviously something but not known what!
oxygen, carbon, hydrogen, nitrogen, phosphorous, and calcium.
The molar mass of SO3 is 80.06 g/mol. Oxygen makes up three of these four atoms, so the oxygen's molecular weight in SO3 is 48 g/mol (3 x 16). Therefore, the percent by weight of oxygen in SO3 is (48 g/mol / 80.06 g/mol) x 100% = 59.97%.
Water.water