A520-gram sample of seawater contains 0.317 moles of nacl. what is the percent composition of nacl in the water? a. 1.1% b. 2.8% c. 3.6% d. 6.1%

option c. 3.6%

Explanation:

1) Definition (formula)

Percent composition = (mass of solute / mass of solution) × 100.

2) Mass of solution = mass of seawater = 520 g.

3) Mass of solute

a) mass = molar mass × number of moles

b) The molar mass of NaCl may be calculated using the atomic masses of the elements given in a periodic table: 22.990 g/mol + 35.453 g/mol =  58.443 g/mol

c) mass of NaCl = 58.443 g/mol × 0.317 mol = 18.53 g.

d) Percent composition = (18.53 g / 520 g) × 100 = 3.6% ← answer

C. 3.6%

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