Answer :
Final answer:
The mass percent of Na in sodium chloride (NaCl) is 39.3%, option C. This is calculated by dividing the molar mass of sodium (Na) by the molar mass of NaCl and expressing it as a percentage.
The correct option is (C)
Explanation:
Sodium chloride (NaCl), commonly known as table salt, is composed of two elements: sodium (Na) and chlorine (Cl). To find the mass percent of Na in NaCl, we need to calculate the ratio of the mass of Na to the total mass of NaCl and then express it as a percentage.
The molar mass of Na is approximately 22.99 g/mol, and the molar mass of Cl is approximately 35.45 g/mol. Since NaCl consists of one Na atom and one Cl atom, its molar mass is the sum of the molar masses of Na and Cl:
Molar mass of NaCl = Molar mass of Na + Molar mass of Cl
Molar mass of NaCl = 22.99 g/mol + 35.45 g/mol
Molar mass of NaCl = 58.44 g/mol
Now, to find the mass percent of Na in NaCl, we calculate the mass of Na and divide it by the molar mass of NaCl:
Mass of Na = (Molar mass of Na / Molar mass of NaCl) * 100%
Mass of Na = (22.99 g/mol / 58.44 g/mol) * 100%
Mass of Na = 39.3%
So, the mass percent of Na in sodium chloride is 39.3%, which corresponds to option C.
Therefore, The correct option is (C)
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