Elemental calcium reacts with water at room temperature to form calcium hydroxide and hydrogen gas as shown in this equation. So
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Answer: The correct formula for phosphorous pentachloride is because a subscript 5 indicates five chlorine (Cl) atoms.
Explanation: For the given molecule, phosphorous pentachloride, there are 2 atoms present which are phosphorous and chlorine atoms.
Number of phosphorous atoms = 1
Number of chlorine atoms = 5
So, the correct formula for phosphorous pentachloride will be because the subscript 5 represents the 5 chlorine atoms.