All I need is the answer. If you care to explain that is fine as well, its up to

Question

All I need is the answer. If you care to explain that is fine as well, its up to you. Thank You So much! :D

1. The oxygen-carrying protein known as hemoglobin is 0.335% Fe by mass and contains four Fe atoms per hemoglobin molecule. Calculate the molecular weight of this protein.

2. Calculate the atomic weight of the metal, M, that forms a compound with the formula MCl2 that is 74.5% Cl by mass.(Answer is in amu)

3. Caffeine is a central nervous system stimulant found in coffee, tea, and cola nuts. Calculate the molecular formula of caffeine if the compound is 49.48% C, 5.19% H, 28.85% N, and 16.48% O by mass and has a molecular weight of 194.2 grams per mole.

4. ?-Carotene is the protovitamin from which nature builds vitamin A. It is widely distributed in the plant and animal kingdoms, always occurring in plants together with chlorophyll. Calculate the molecular formula for ?-carotene if the compound is 89.49% C and 10.51% H by mass and its molecular weight is 536.89 grams/mol.

Explanation / Answer

1.

6.7 x 10^4 g/mol

2.

24.3 or 24 amu

3.

Empirical - C4H5N2O and Molecular formula - C8H10N4O2
4.

Empirical - C5H7 and Molecular formula - C40H56

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