Interpretation:
Whether sodium chloride formed from the combination of sodium and chlorine is a compound or mixture needs to be determined.
Concept introduction:
A compound is a substance that is composed of two or more different elements in a fixed ratio.

Answer to Problem 90A
Sodium chloride is an ionic compound also known as common salt.
Explanation of Solution
Sodium reacts chemically with chlorine gas to form sodium chloride that is an ionic compound.
Two moles of sodium reacts with one mole of chlorine to produce two moles of common salt.
Sodium chloride is a compound that consists of two elements sodium and chlorine, that is usually found in solid state.
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