Juventus appeared confident from the off and Dusan Vlahovic threatened Como's goal in the 20th minute when his header went just wide, before Mbangula put them in front in the 23rd with a solo effort.
Rejuvenated Juventus start a new chapter under Motta, who led Bologna to the Champions League last season and will now hope to bring the Serie A title back to Turin for the first time in four years.
Mbangula also became the youngest Belgian goalscorer in the history of Serie A and the first Belgian player to score in the Italian top flight for Juve.
It was a harsh night for visitors Como, who challenged Juve for possession but lacked the quality to create clear chances on their return to the Italian top flight after 21 years.
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