Question 558276
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b) The conversion factor to get from teaspoons to milligrams of sodium, as stated in the problem, is (2300 mg sodium/1 teaspoon salt)
We can multiply it times (1 g sodium/1000mg sodium) to get
(1 g sodium/1000mg sodium)(2300mg sodium/1 teaspoon salt)=2.3 g sodium/1 teaspoon of salt
c) Based on that conversion factor, the 6 teaspoons of salt added contributed
(6 teaspoons salt)(2.3 g sodium/1 teaspoon of salt)=13.8 g sodium
d) Table salt is sodium chloride, with formula NaCl.
e) The sodium and the chlorine are present as ions Na+, and Cl- (The + and - are supposed to be superscripts, written higher than the other characters, as if they were exponents). The sodium cations and chloride anions are charged and held together by electrostatic forces (opposites attract). It is called an ionic bond.
It is not really a molecule. A salt crystal is an arrangement of sodium ions and chloride ions, with same number of both, but not arranged in pairs. Each sodium ions is surrounded by chloride ions, and each chloride ion is surrounded by sodium ions. The minimum unit with the composition of sodium chloride would be one ion of each. That is called a formula unit (not a molecule). The mass of a formula unit of sodium chloride, in atomic mass units, is the sum of the atomic masses of sodium and chlorine (22.99+35.45=58.44) and is the formula weight of sodium chloride. It is a formula weight, not a molecular weight. The ratio of masses of sodium and sodium chloride is (22.99 units of Na/58.44 units NaCl).
From that ratio we can calculate
(22.99 g Na/58.44 g NaCl)(about 5 g NaCl/1 teaspoon salt)=about 2 g Na/1 teaspoon salt