The percent of water in an unknown hydrated salt is to be determined by weighing a sample of the salt heating it to drive off the water cooling to room temperature and re-weighting. Which procedural mistake will explain a determined very low % of water. I.  Heating the sample in a closed rather than an open container II.  Re-weighting the sample before it has cooled to room temperature. I only Both I and II II only Neither I nor  II

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