I need so I don't understand what this question is asking

Which best explains why an iceberg floats?

What is the molar mass of potassium nitrate, kno3

Which of the following is a conclusion that resulted from ernest rutherford’s scattering experiment? (will mark brainliest) a. the nucleus is negatively charged b. the atom is a dense solid and is indivisible c. the mass is conserved when atoms react chemically d. the nucleus is very small and the atom is mostly empty space