The word(s) "mercy" appears 164 time(s) in 155 verse(s) in Quran in Muhammad Pickthal translation.

(151) Lo! thy Lord knoweth how thou keepest vigil sometimes nearly two-thirds of the night, or (sometimes) half or a third thereof, as do a party of those with thee. Allah measureth the night and the day. He knoweth that ye count it not, and turneth unto you in mercy. Recite, then, of the Qur'an that which is easy for you. He knoweth that there are sick folk among you, while others travel in the land in search of Allah's bounty, and others (still) are fighting for the cause of Allah. So recite of it that which is easy (for you), and establish worship and pay the poor-due, and (so) lend unto Allah a goodly loan. Whatsoever good ye send before you for your souls, ye will find it with Allah, better and greater in the recompense. And seek forgiveness of Allah. Lo! Allah is Forgiving, Merciful.

(152) And they will not heed unless Allah willeth (it). He is the fount of fear. He is the fount of mercy.

(153) He maketh whom He will to enter His mercy, and for evil-doers hath prepared a painful doom.

(154) Nay, but surely on that day they will be covered from (the mercy of) their Lord.

(155) Then hymn the praises of thy Lord, and seek forgiveness of Him. Lo! He is ever ready to show mercy.