5. Questiorn Be sure to answer all parts. Assistance The compound 2,3-dimercapto

Question

5. Questiorn Be sure to answer all parts. Assistance The compound 2,3-dimercaptopropanol (HSCH2CHSHCH2OH), commonly known as British anti-Lewisite (BAL), was developed during World War I as an antidote to arsenic-containing poison gas. Print Question Help Report a Proble (a) If each BAL molecule binds one arsenic (As) atom, how many As atoms can be removed by 1.7 g of BAL? ×10 Enter your answer in scientific notation. atoms (b) BAL can also be used to remove poisonous 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 H atom is removed when a BAL molecule binds an Hg atom.) mass %

Explanation / Answer

a )

KBr moles = 6.52 / 119 = 0.05479

1 mole -------------------> 6.023 x 10^23 molecules

0.05479 mole --------------> 6.023 x 10^23 x 0.05479 = 3.3 x10^22 molecules

number of cations = 3.3 x10^22 molecules

number of anions = 3.3 x10^22 molecules

b)

moles of Na2SO4 = 3.71 / 142 = 0.0261

molecules of Na2SO4 = 0.0261 x 6.023 x 10^23 = 1.57 x 10^22

cations = 2 x 1.57 x 10^22

cations = 3.15 x 10^22

anions = 1.57 x 10^22

c)

moles = 6.26 / 310.18 = 0.02018

number of molecules = 0.02018 x (6.023 x 10^23) = 1.22 x 10^22

cations = 3.65 x 10^22

anions = 2.43 x 10^22

1)

BAL molar mass = 124.22 g/mol

BAL moles = 1.7 / 124.22 = 0.0137

BAL molecules = 0.0137 x 6.023 x 10^23 = 8.24 x 10^21

each molecule can bind 1 As atom

so number of As atoms removed by BAL = 8.24 x 10^21

Related Questions

Navigate

• Browse (All)
• Browse 5
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.