Iron has four naturally occurring isotopes, one of which is far more abundant th

Question

Iron has four naturally occurring isotopes, one of which is far more abundant that the others Iron has an average atomic mass of 55.845 amu. Which isotope is most abundant?^54Fe. 53.9396 amu^58Fe 57 9333 amu^56Fe. 55.9349 amu^70Zn. 69.9253 amu^57Fc, 56.9354 amu A 1.5 g tablet for pain might contain 0.30 g acetaminophen (C_8H_21NO_3, 151.16 g/mol) and 0.044 g codeine (C_18H_21NO_3, 299.36 g/mol). Calculate the number of moles of codeine in the tablet. 1.5 times 10^-4 mol d 5.0 times 10^-3 mol 2.9 times10^-4 mol 1.1 times 10^-1 mol 1.0 times 10^-3 mol How many grams of P_4 (123.88 g/mol) would contain the same number of atoms as 154 g S_8 (256.48 g/mol) a. 18.6 gP_4 40.2 g P_4 596 g P_4 149 gP_4

Explanation / Answer

1. Fe 56 is the most abundant isotope of iron present

2.Grams of codine present = 0.044

Molecular weight = 299.36

No of moles = 0.044/299.36 = 1.469 x 10-4 which is equal to 1.5 x 10-4 mol

3. No of moles of S8 = 2 x no of moles of P4 (since the number of atoms are equal, no of moles should be equal) .

no of moles = wt / molecular weight

X / 123.88 = 2 x 154/256.48

X = 148.76 = 149 g

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