This piece, identified by K.327, is a sacred vocal composition by Mozart, known for its devout text and elegant musical setting. Its arrangement for piano would highlight its melodic clarity and harmonic grace.
Maintain a singing tone and sensitive dynamic control throughout.
Adoramus te (K.327) is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7.
You should be comfortable at Henle level 5 — meaning you can already play level 4–5 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
Adoramus te (K.327) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.