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Since the mass range of the first stars is estimated to be between 30 and 500 Ms, the first stars will either form a black hole or be dispersed completely by a pair instability supernova.
In a pair instability supernova (PISN), the creation and annilation of positron/electron pairs causes the core to be so unstable that it cannot gravitationally collapse further. Hence all the matter is ejected into the intergalactic medium (IGM).