Problem 3.39 Part A The molecular formula of allicin, the compound responsible f

Question

Problem 3.39 Part A The molecular formula of allicin, the compound responsible for the characteristic smell of garlic, is What is the molar mass of allicin? Express your answer using four significant figures. M= 162.3 g/mol Submit My Answers Give Up Correct Part B How many moles of allicin are present in 4.00 mg of this substance? Express your answer using three significant figures mol Submit My Answers Give Up Part C How many molecules of allicin are in 4.00 mg of this substance? Express your answer using three significant figures ? molecules Submit My Answers Give Up Part D How many S atoms are present in 4.00 mg of allicin? Express your answer using three significant figures atoms Submit My Answers Give Up Continue

Explanation / Answer

A)

Molar mass of C6H10OS2,

MM = 6*MM(C) + 10*MM(H) + 1*MM(O) + 2*MM(S)

= 6*12.01 + 10*1.008 + 1*16.0 + 2*32.07

= 162.3 g/mol

Answer: 162.3 g/mol

B)

mass(C6H10OS2)= 4.00 mg

= 0.004 g

number of mol of C6H10OS2,

n = mass of C6H10OS2/molar mass of C6H10OS2

=(0.004 g)/(162.3 g/mol)

= 2.47*10^-5 mol

Answer: 2.47*10^-5 mol

C)

number of molecules = number of mol * Avogadro’s number

number of molecules = 2.47*10^-5 * 6.022*10^23 molecules

number of molecules = 1.48*10^19 molecules

Answer: 1.48*10^19 molecules

D)

1 molecule has 2 S atoms

So,

number of S = 2*1.48*10^19 molecules

= 2.96*10^19 atoms

Answer: 2.96*10^19 atoms

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