Question

Your experiment requires 150 mL of 7.7 M NaOH. How many grams of NaOH will you need?

Answer 1

You have molarity and you have volume. Use the formula :
Molarity(M)= Moles(N)/Liter(L)            to get the solution. 
150 ml= .150 L
7.7 = N/.150
N=.1.155 moles of NaOH.
 And since you know the moles, use the molar mass to figure out the grams.
 (40g/mol NaOH) x (1.155mol) =  
46.2 g of NaOH.