You are asked to identify an unknown liquid that is known to be one of the liquids listed below. You pipet a 3.50-mL sample into a beaker. The empty beaker had a mass of 12.20 g, and the beaker plus the liquid weighed 16.08 g. 

(a) Calculate the density and identify the unknown. 

(b) If you were able to measure the volume to only two significant figures (that is, 3.5 mL, not 3.50 mL), will the results be sufficiently accurate to identify the unknown? Explain.

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Substance Ethylene glycol Water Ethanol Acetic acid Glycerol Density at 25 °C (g/cm³) 1.1088 (major component of automobile antifreeze) 0.9971 0.7893 (alcohol in alcoholic beverages) 1.0492 (active component of vinegar) 1.2613 (solvent used in home care products)