Be sure to answer all parts. Repo Dimercaprol (HSCH2CHSHCH2OH) was developed dur

Question

Be sure to answer all parts. Repo Dimercaprol (HSCH2CHSHCH2OH) was developed during World War I as an antidote to arsenic- based poison gas and is used today to treat heavy-metal poisoning. It binds the toxic element and carries it out of the body (a) If each molecule binds one arsenic (As) atom, how many atoms of As could be removed by 973 mg of dimercaprol? Guide 10 atoms As (Enter your answer in scientific notation.) (b) If one molecule binds one metal atom, calculate the mass % of each of the following metals in a metal-dimercaprol combination: mercury, thallium, chromium % Hg %Tl %Cr

Explanation / Answer

a)

Answer

4.72×1021 atoms As

Explanation

No of mole of dimercaprol =124.225g/mol

mass of dimercaprol = 973mg =0.973g

No of mole of dimercaprol =0.973g/124.225g/mol = 0.007833mol

1mol = 6.022×1023molecules

No of molecules = 0.007833×6.022×1023 = 4.72×1021

one dimercaprol molecule bind one As atom

No of As atoms could be removed = 4.72×1021atoms

b)

i) molar mass of Hg = 200.592g/mol

molar mass of dimercaprol = 124.225g/mol

mass of Hg- dimercaprol = 324.817g/mol

mass % of Hg =( 200.592g/324.817)×100 = 61.76%

ii) Molar mass of Tl = 204.38g/mol

molar mass of Tl-dimercaprol = 328.605g/mol

mass % of Tl = (204.38g/328.605g)×100 = 62.90%

iii) Molar mass of Cr = 51.996g/mol

Molar mass of Cr-dimercaprol = 176.221g/mol

mass % of Cr = (51.996g/176.221g)×100=29.51%

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