If the half-life of Xe-133 is 5.2 h, what will be the activity of the initially 36-mCi sample after 15.6 h? Express your answer using two significant figures.

If 4.8 moles of x and 3.4 moles of y react according to the reaction below, how many moles of the excess reactant will be left over at the end of the reaction? 3x + 2y “yields”/ x3y2. a. 1.7 mol y left over b. 1.6 mol x left over c. 0.2 mol y left over d. 0.1 mol x left over