quantum is right, you can break the chord or roll it. BUT if you do reach the whole chord, you should try to do it. Just practice the bar where the chord is very slowly and a lot of times, without tensing your arm. And don't play with the whole finger, just the tip of the finger.
Personally the largest chord I have found in a piece was from E to C in the left hand, I have large hands

but still I had to practice it a lot because it was a very fast staccato 1/8 note and it was repeated throught the piece.
In your place I would just play what the composer wrote (some composers like Rachmaninoff wrote very large chords because they had very large hands

)