obviously something but not known what!
We can't tell. What's the other 90 percent? If you meant 40/60 instead... the mass of sulfur is twice that of oxygen, so a mass ratio of 40:60 is equivalent to an atom ratio of 1:3. The empirical formula would be SO3.
No, water is not made up of 33 percent hydrogen and 67 percent oxygen. The chemical formula for water is H2O, which means each water molecule contains two hydrogen atoms and one oxygen atom. By mass, water is approximately 11 percent hydrogen and 89 percent oxygen. This is because the atomic mass of oxygen is about 16 times that of hydrogen.
You cannot without information on the densities of the two substances.
It is around 21/2 %, by weight.
The weight will depend on how much of the substance there is.
Oxygen comprises about 47% by weight of Earth's crust
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Oxygen
Oxygen!ElementAbundancepercent by weightAbundanceparts per million by weightOxygen46.1%461,000Silicon28.2%282,000Aluminum8.23%82,300Iron5.63%56,300Calcium4.15%41,500Sodium2.36%23,600Magnesium2.33%23,300Potassium2.09%20,900Titanium0.565%5,650Hydrogen0.14%1,400
This element is oxygen.
Oxygen
Oxygen
Oxygen
it is 77
Air dissolved in water contains a higher percentage of oxygen than nitrogen because oxygen is more soluble in water than nitrogen. This is due to the differences in their molecular characteristics, such as molecular weight and polarity, which affect their solubility in water.
This element is oxygen.
Compounds like hydrogen peroxide (H2O2) and sodium chlorate (NaClO3) contain large percentages of oxygen by mass due to their chemical compositions. For example, in hydrogen peroxide, each molecule contains two oxygen atoms, making up a significant portion of its molecular weight.