A chewable antacid tablet is labeled to contain 0.350 g of magnesium hydroxide (Mg(OH)2). A research team experimentally counts 3.5×1021 hydroxide ions released from one tablet when it dissolves completely. Based on the tablet’s mass, what is the percent error in the experimental hydroxide-ion count?
a) 48%
b) 3.7%
c) 52%
d) 105%