A. none of the above
B. 12000 m/s
C. 0.53 m/s
D. 1.875 m/s

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.

11. phosphorus-32 is radioactive and has a half life of 14 days. how much of a 124 mg sample of phosphorus-32 is present after 56 days? a) 7.75 mg b) 15.5 mg c) 31.0 mg d) 62.0 mg

Why is the melting of ice a physical change ?