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If you think to magnesium oxide and to concentration of oxygen in MgO the answer is 40,007 33 % oxygen.
MgO
To find the percent composition of oxygen in Na2O, find the total molar mass of the compound. Then, divide the molar mass of oxygen by the molar mass of the compound, and multiply by 100% to get the percent oxygen.
MgO is a compound because it has more than one type of element in it, magnesium and oxygen.
Oxygen atoms weigh more than Hydrogen atoms.
If you think to magnesium oxide and to concentration of oxygen in MgO the answer is 40,007 33 % oxygen.
60%
MgO
The percent by mass of oxygen in N2O4 is 69,56 %.
To find the percent composition of oxygen in Na2O, find the total molar mass of the compound. Then, divide the molar mass of oxygen by the molar mass of the compound, and multiply by 100% to get the percent oxygen.
The mass percent of oxygen in SO2 is 50 %.
the answer is 29 percent
magnesiumoxide MgO
The percent of Mg calculated will be too high. Let's say that you reacted 1.00 g of Mg and made some MgO, but so much MgO escaped as smoke that only 1.00 g of MgO was left. You would then conclude from the numbers that the mass of O in the MgO was zero! This would lead you to conclude that the percent of Mg in the MgO was 100 %, which is silly and clearly in error. Although this is an extreme example, it illustrates that the loss of MgO as smoke from the crucible leads to a percent of Mg (calculated) that is above the expected 60.3 %.
Estriol (C18H24O3) contain 16,644 % oxygen.
60%
60%