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i) Adrenaline contains 13 hydrogen atoms, 9 carbon atoms, 3 oxygen atoms, and 1 nitrogen atom. What is the chemical formula for adrenaline?
Express your answer as a chemical formula.

ii) A certain compound is made up of two fluorine atoms, one chlorine atom, and one phosphorus atom. What is the chemical formula of this compound? Express your answer as a chemical formula.

iii) Calcium chloride contains only calcium and chlorine. What is the formula for this compound. Express your answer as a chemical formula.

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