What is the percent of carbon by mass in acetone CH3C(O)CH3?

What is the percent of carbon by mass in acetone CH3C(O)CH3?

Which answer choice shows the correct chemical formula for barium sulfate?

Which answer choice shows the correct chemical formula for barium sulfate?

What is the percent composition of potassium in K2Cr2O7?

What is the percent composition of potassium in K2Cr2O7?

Which of the following isotopes has the greatest number of neutrons?

Which of the following isotopes has the greatest number of neutrons?

Which of the following does not have the empirical formula CH?

Which of the following does not have the empirical formula CH?