Rydych yn amddiffyn moleciwl bensen, sydd am i ddinistrio sylweddau eraill. I arbed moleciwl hwn, dylech osod y dŵr o sylweddau cemegol gwahanol. Mae pob tŵr ei eiddo, felly meddyliwch drosodd o flaen llaw ble a sut yr ydych yn gosod nad yw, ni waeth wedi cyrraedd y moleciwl.
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