Heme molecules are responsible for the red pigmentation of blood cells. Differin

Question

Heme molecules are responsible for the red pigmentation of blood cells. Differing chemically isolated molecular heme compounds are named as "Heme X" (where "X" is a variable denoting the actual molecular fragments which are represented by the labels R3, R8, and R18).
A) Suppose one molecule of Heme X contains 4 oxygen atoms, and Heme X is 9.82 % oxygen by weight. Using only this information and the atomic mass of oxygen, determine the molecular mass of Heme X.
B) The Heme X molecule contains one chlorine atom. What mass of chlorine is found in 5.43 g of Heme X compound?
ROGERS 9:07 PM nernst.chem.sfu.ca 18961 C_N CH C-N CCH R18 CH2 Heme molecules are responsible for the red pigmentation of blood cells. Differing chemically isolated molecular heme compounds are named as "Heme X" (where "X" is a variable denoting the actual molecular fragments which are represented by the labels R3, Rg, and R18) Suppose one molecule of Heme X contains 4 oxygen atoms, and Heme X is 9.82 % oxygen by weight. Using only this information and the atomic mass of oxygen, determine the molecular mass of Heme X amu 1pts Submit Answer Tries 0/5 The Heme X molecule contains one chlorine atom. What mass of chlorine is found in 5.43 g of Heme X compound?

Explanation / Answer

a) Let the molecular mass of Heme X be y

Mass of 4 oxygen atoms = 16 amu * 4 = 64 amu

Mass percent of oxygen = 9.82%

So the equation will be

9.82/100 * y = 64

y = 651.73 amu

Hence the molecular mass of Heme X is equal to 651.73 amu

b)

Number of moles of Heme X = Mass/molar mass = 5.43/651.73 = 0.00833165 moles

Mass of chlorine in the compound = mass of one mole of chorine * number of moles of Cl

=> 35.5g/mol * 0.00833165 mol

=> 0.29577 grams

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