how many grams of NAOH(40g/mol) are there in 250 mL of 0.4M NAOH solution?

the answer is 4.

i solved befor but i can not do it again.

given the following half-cell reaction:

cl2(g)+2e______ 2cl E=01.36v

cu2+ (aq) +2e_______ cu(S) E=+0.34

answer is:-1.02 i keep getting =1.02