Question

4.6781600 107 100 3x10-4 8. Some lake water is found to contain 5.00 ppm of methyl mercury, Hg(CH3)2. a) What is the concentration of methyl mercury in weight percent? moss. - 9 Pom - Mass Soule Hg(CH) 10 - 0 1 +1008x2)) x2 = 230.658, 50. S 330. 688 5 Solution 3.00 230.658 106 mais solution DI 5.00 106. 030.656 → mass soulion 230 Mats Solution 5.00 *10-6 b) Assuming the density of the lake water is 1.00 g/mL, what is the molarity of methyl mercury in the lake water? M mo! (CH3)2 = 230.65 235.658 5.00 x10"% 46131600, 4.6131600x109

Answer 1

(a) 10000ppm = 1% by weight

5.00ppm = (1/10000ppm)× (5.00ppm) % = 5.00×10^-4 % (Answer)

(b)

100g of solution has 5.00×10^-4g solute = 5.00×10^-4g/

230.658g/mol = 2.1677×10^-6mol

Density of solution = 1.00g/ml

100g of solution has volume = 100.ml = 0.100L

Molarity = 2.1677×10^-6mol/0.100L = 2.1677×10^-5mol/L

= 2.17×10^-5 M. (Answer)