Mo’unga converted and added a second after Beauden Barrett scampered over after a neat Aaron Smith drop-off that left Wales prop Dillon Lewis prone.
A sustained period of Welsh pressure then followed and paid off after Patchell found Hallam Amos with a long miss-pass, the fullback dummying Mo’unga and shooting over for a try.
Patchell added the conversion and then a simple penalty, but New Zealand roared back through veteran Ben Smith, the winger jinking his way through a crowded defence after good lead-up work by Read and Liam Coltman.
Smith, 33, got his double on the stroke of halftime, taking a long pass from his namesake Aaron and powerfully handing off Tomos Williams to slide into the corner.
Mo’unga added the extras to leave New Zealand in complete control at 28-10 at halftime.
The cut and thrust, running rugby continued in the second period, Ben Smith surging deep into Welsh territory before Sonny Bill Williams provided a perfect offload for centre partner Ryan Crotty to cross for the try.
Both sides were much different from their semi-final line-ups, Hansen having made seven changes to the team which lost 19-7 to England and Gatland nine from the side that went down 19-16 to South Africa.
One ever-present on the team list for Wales, however, has been Josh Adams, and the winger burrowed over from close range for a seventh try of the tournament to usurp Shane Williams’ Welsh record of at a World Cup.
The game became increasingly error-strewn, but Mo’unga stepped through Dan Biggar’s poor tackle for a late try, taking his personal tally to 15 points.
“It was just important we come back and honoured the jersey and our fans and get over the disappointment of last week,” said Hansen, referring to the semifinal defeat by England.
“Tough old game for both sides and just want to congratulate Wales too because I know they’ll be feeling a bit at the moment.”
Fellow New Zealander Gatland will now return home to coach the Chiefs.
“Our boys never gave up and kept trying to play some good rugby in the second half,” Gatland said.
“Probably a game too far for us really.
“I’ve loved my time in Wales.
“People have been amazing and incredibly welcoming.
“But that era’s over now and I’m excited about the next challenge going back to New Zealand and being involved with the Chiefs.”
New Zealand 40 (Ben Smith 2, Joe Moody, Beauden Barrett, Ryan Crotty, Richie Mo’unga tries; Mo’unga 5 conversions) Wales 17 (Hallam Amos, Josh Adams tries; Rhys Patchell conversion, penalty, Dan Biggar conversion). HT: 28-10
RE-LIVE ALL THE ACTION IN OUR BLOG BELOW!