Be sure to answer all parts. The compound 2,3-dimereaptopropanol(HSCH2 CHSHCH2OH

Question

Be sure to answer all parts. The compound 2,3-dimereaptopropanol(HSCH2 CHSHCH2OH), commonly known as British anti-Lewisite(BAL), was developed during World War I as an antidote to arsenic-containing poison gas. (a) If each BAL molecule binds one arsenic(As) atom, how many Asatoms can be removed by 2.6 g of BAL?

?? x 10 ??atoms

Enter your answer in scientific notation. (b) BAL can also be used to remove pois heavy metals like mercury(Hg) and lead(Pb) if each BAL binds one Hg atom, calculate the mass percent of Hg in a BAL-Hg complex. (An Hatom is removed when a BAL molecule binds an Hg atom.)

??? mass%

Explanation / Answer

1 BAL = 1 As atom

MW of BAL = 124.225 G/mol

mol = mass/MW = 2.6/124.225 = 0.0209 mol of BAL

so..

0.0209 mol of BAL --> 0.0209 mol of As

1 mol = 6.022*10^23 atoms

0.0209 --> 0.0209 *6.022*10^23 atoms = 1.258*10^22 aoms of As

b)

ratio is 1:1

so..

MW of Hg = 200.59 g/mol

for a 1:1 mix of Hg:BAL

% Hg = 200.59 / (200.59 +124.225 ) * 100%= 61.75 %

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