Anew synthetic element has two isotopes. if the first isotope has a mass of 259.98 amu and a percent abundance of 54%, what is the percent abundance of the second isotope

2. how is heavy water different from normal water

In saturated organic compounds, all the bonds between carbon atoms are called?

In a laboratory, 1.55mg of an organic compound containing carbon, hydrogen, and oxygen is burned for analysis. this combustion resulted in the formation of 1.45mg of carbon dioxide and .89 mg of water. what is the empirical formula for this compound?