A substance was analysed and found to contain 26.57 % potassium, 35.36% chromium, and 38.07 % oxygen by mass.
What is the empirical formula of the substance?

Select one:
question
O a. K2Cr205
O b. K2Cr207
O c. KCr2O7
O d. K_Cro

10. according to the law of conservation of mass, how does the mass of the products in a chemical reaction compare to the mass of the reactants?

If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?

The twister and runaway train are two coasters at the same amusement park. both coasters start at the same height. the coaster for the twister is twice the mass of the coaster for the runaway train. which roller coaster has greater gravitational potential energy at the start of the ride?