Help! How is this incorrect?

The reaction q+r2=r2q is found to be first order in r2 and

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

Which statement is usually true about the relationship between activation energy and reaction rates? low activation energy barriers result in low rates. high activation energy barriers result in low rates. low activation energy barriers result in no reaction. high activation energy barriers result in no reaction.