Answer:
I would guess the answer is B.
Explanation:
Procactive doing something before it needs to be done. So boarding up the windows before the storm causes damage would be my guess.
1. Sit with them at lunch and in class.
2. Be in the same sports as them so that we can hang out.
3. Put notes in each other's lockers.
Find the moles of Boron and of Chlorine:
Assume there are 100 g of the compound in all
Boron: 9.224% --> .09224 (convert percent to decimals)
.09224*100g = 9.224g Boron (theoretical amt)
9.224g* 1mol/10.81g (molar mass Boron) = .8533 moles Boron