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How many molecules in a 4 inch hair? Let θ be an acute angle of a right triangle for which sin θ = 12
13
. Find cos θ.? Compound has an empirical formula of ch and was found to have a mass of 78 grams calculate molecular formula? At 25°C a solution has a hydroxide-ion concentration of 3× 10–5 M. What is its hydronium-ion concentration? What is dry mustard?