Help with this slide, thank you.

Which statement about the stamps is correct?

What is the number of moles in 15.0 g ash3?

Indicate whether the specified alkyl halides will form primarily substitution products, only elimination products, both substitution and elimination products, or no products when they react with sodium methoxide. 1-bromobutane 1-bromo-2-methylpropane 2-bromobutane 2-bromo-2-methylpropane