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The decrease of the crystal weight (4%) consists of two components: 1) loss of Ge and 2) acquiring of B which is lighter than Ge (so it is the same effect as loss). So we have two negative effects which together make a contribution of -4%. If we deduct the part of B we will get the part of Ge that was lost.
in 0.96g quantity both Ge and B are present but in 0.04 missing quantity of crystal how u calculate the weight of Ge by 0.04-0.00015