Question

A 520-gram sample of seawater contains 0.317 moles of NaCl. What is the percent composition of NaCl in the water?

Answer 1

Answer:

3.5%

Explanation:

moles = given mass / molar mass

here , 0.317 = x / 58.5

x =  18.54 g

Now % composition =  mass of a compound / total mass * 100

                                     (18.54/520) * 100 = 3.5 %