QQuestionChemistry
QuestionChemistry
"What is the molar mass of one mole of Iron (Fe)?
A. 55.95 g/mol
B. WLBS amu
C. 111.86 amu"
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Answer
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Step 1:: Understand the problem
The problem asks us to find the molar mass of iron, which is a physical property of the element. The molar mass is the mass of one mole of a substance, measured in grams per mole (g/mol). For elements, the molar mass is the sum of the atomic weights of its constituent atoms.
Step 2:: Find the atomic weight of iron (Fe)
Iron has an atomic number of 26, which means it has 26 protons in its nucleus. According to the periodic table, the atomic weight of iron is approximately 55.85 atomic mass units (amu). The atomic mass unit is defined as one twelfth of the mass of a carbon- 12 atom, and it is used as the unit for atomic and molecular weights.
Step 3:: Convert atomic weight to molar mass
Since the molar mass is the mass of one mole of a substance, and one mole contains 6.022 x 10^23 atoms or molecules, we can convert the atomic weight to molar mass by multiplying the atomic weight by the molar mass constant (M_r), which is defined as 1 g/mol. Therefore, the molar mass of iron is: M(Fe) = atomic weight of Fe x M\_r M(Fe) = 55.85 amu x 1 g/mol
Step 4:: Simplify the equation
Since the atomic weight is already given in grams per mole, the molar mass is simply the atomic weight: M(Fe) = 55.85 g/mol
Final Answer
The molar mass of one mole of iron is approximately 55.95 g/mol (rounded to three significant figures). Therefore, the answer is A. 55.95 g/mol. The other options, WLBS amu and 111.86 amu, are not correct units for molar mass.
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