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What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5

What is the mass of 2.00 l of an intravenous glucose solution with a density of 1.15 g/ml?

When the chemicals iron sulfide (fes) and hydrochloric acid (hcl) are combined, bubbles appear from the mixture. 1. does the appearance of bubbles indicate a physical or chemical change? 2. why do the bubbles indicate this change? 3. what property is this?