Does giving charity to the mosque expiate the sins of watching pornographic films and images and repeated masturbation, during Ramadan and otherwise, after sincere repentance?

Repentance is accepted given its conditions (abstaining from sin, regretting it, and resolving not to return to it). No sin is greater than Allah Almighty's forgiveness. Giving charity after repentance is an additional good deed and is from the guidance of the Salaf. If a sin occurs during the daytime in Ramadan, one must review what is required regarding the fast.