This set up of a conversion table should show you that if you multiply
the grams of BeI2 times .02 moles, it equals <span>5.256 g (your answer) </span>
7.5 is the answer. You have to move the decimal 2 places to the right.
Hmm... I'm unsure but its either B or D.
4.88x10^20 H2O2 molecules