The concentration of Na in seawater is 0.470 M.How many grams of Na can be extracted from 10.0 kg of seawater if the recovery rate is 60.0%?
A)0.470
B)64.8
C)4.70
D)108
E)43.2

Question

Quizplus · Accepted Answer

First, we need to calculate the moles of Na in 10.0 kg of seawater:
10.0 kg = 10,000 g
Moles of Na = (0.470 mol/L) x (10,000 g / 1000 mL) = 4.70 mol

Then, we need to apply the recovery rate of 60%:
0.60 x 4.70 mol = 2.82 mol

Finally, we can calculate the mass of Na:
Mass of Na = 2.82 mol x 23.0 g/mol = 64.86 g

Therefore, the answer is B.

The Concentration of Na in Seawater Is 0