25.6 grams of sodium reacts with an excess of oxygen. how many grams of sodium oxide will be produced

First, find the equation for 

Oxygen hangs out in groups of 2 when alone so you have 


Next, to balance NaO you see that Na has a charge of +1 and O has -2
You need 2 Na for the one O and now you have


Now you need to balance. 2 Os are on the left so make
    Now you have 4 Na on the right, just make Na, 4Na

Now you have the equation 

Transfer grams to moles:
Divide the given grams (25.6) by the atomic weight of our variable (Na = 22.99)
25.6/22.99= 1.11352762   This is the number of moles you have.

Use the ratio of the amount of the element or compound to the one you want
It'll look like this  
Multiply 1.11352762 by 2 then divide by 4 leaving you with 0.55676381

Finally, multiply that by the atomic mass of 
Na2 = 22.99*2 = 45.98+ O = 16 =

61.98g of is your answer

1= c 2= a or d3 = idk sorry 4= c5= c