94Pu -> xa + y_p + 90Th. Ushbu yadro reaksiyasida 123 g Pu yemirili

74. (V19/20-130-13) 94Pu -> xa + y_p + 90Th. Ushbu yadro reaksiyasida 123 g Pu yemirilishidan 115 g Th izotopi hosil boldi. Agar x ning qiymati Сѓ ning qiymatiga teng bolsa, Pu izotopining nisbiy atom massasini aniqlang. A)258 B)230 C)256 D)246