The word(s) "mercy" appears 168 time(s) in 158 verse(s) in Quran in Mohsin Khan translation.

(141) And thus We have sent to you (O Muhammad صلى الله عليه و سلم) Ruh (a Revelation, and a mercy) of Our Command. You knew not what is the Book, nor what is Faith? But We have made it (this Qur'an) a light wherewith We guide whosoever of Our slaves We will. And verily, you (O Muhammad صلى الله عليه و سلم) are indeed guiding (mankind) to the Straight Path (i.e. Allah's Religion of Islamic Monotheism).

(142) Is it they who would portion out the mercy of your Lord? It is We Who portion out between them their livelihood in this world, and We raised some of them above others in ranks, so that some may employ others in their work. But the mercy (Paradise) of your Lord (O Muhammad صلى الله عليه و سلم) is better than the (wealth of this world) which they amass.

(143) (As) a mercy from your Lord. Verily, He is the All-Hearer, the All-Knower.

(144) Except him on whom Allah has mercy. Verily, He is the All-Mighty, the Most Merciful.

(145) This (Qur'an) is a clear insight and evidence for mankind, and a guidance and a mercy for people who have Faith with certainty.

(146) Then, as for those who believed (in the Oneness of Allah - Islamic Monotheism) and did righteous good deeds, their Lord will admit them to His mercy. That will be the evident success.

(147) And before this was the Scripture of Musa (Moses) as a guide and a mercy. And this is a confirming Book (the Qur'an) in the Arabic language, to warn those who do wrong, and as glad tidings to the Muhsinun (good-doers. See the footnote of V.9:120).

(148) They are the ones who disbelieved (in the Oneness of Allah - Islamic Monotheism) and hindered you from Al-Masjid-al-Haram (at Makkah) and detained the sacrificial animals from reaching their place of sacrifice. Had there not been believing men and believing women whom you did not know, that you may kill them and on whose account a sin would have been committed by you without (your) knowledge, that Allah might bring into His mercy whom He wills - if they (the believers and the disbelievers) had been apart, We verily would have punished those of them who disbelieved with painful torment.

(149) The believers are nothing else than brothers (in Islamic religion). So make reconciliation between your brothers, and fear Allah, that you may receive mercy.

(150) So flee to Allah (from His Torment to His mercy - Islamic Monotheism). Verily, I (Muhammad صلى الله عليه وسلم) am a plain warner to you from Him.