You heat 3.784 g of a mixture of Fe3O4 and FeO to form 4.102 g Fe2O3. the mass percent of FeO originally in the mixture was: A: 94.4%
B: 32.8%
C: 67.2%
D: 22.7%
E: none of these

What is the relationship between particles in matter

Of element x has 22 protons, how many electrons does it have

What is the relationship between ka and kb with kw? the sum of ka and kb equals the auto-dissociation constant for water. the product of ka and kb equals the auto-dissociation constant for water. the quotient of ka and kb equals the auto-dissociation constant for water. the difference of ka and kb equals the auto-dissociation constant for water.