Multiple Choice
Which quantity is equivalent to 39 grams of LiF?
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2. Atoms & Elements
Calculating Molar Mass
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How many grams of Fe_2O_3 are present in 0.500 mole of Fe_2O_3?
A
79.9 g
B
159.7 g
C
55.8 g
D
80.0 g
Verified step by step guidance1
Identify the given quantity and what is asked: You have 0.500 moles of Fe_2O_3 and need to find the mass in grams.
Calculate the molar mass of Fe_2O_3 by adding the atomic masses of its elements: Fe (iron) has an atomic mass of approximately 55.8 g/mol, and O (oxygen) has an atomic mass of approximately 16.0 g/mol. Since Fe_2O_3 contains 2 Fe atoms and 3 O atoms, the molar mass is calculated as \(\text{Molar mass} = 2 \times 55.8 + 3 \times 16.0\) g/mol.
Use the relationship between moles, molar mass, and mass: \(\text{Mass} = \text{Moles} \times \text{Molar mass}\).
Substitute the given moles (0.500 mol) and the calculated molar mass into the formula to find the mass of Fe_2O_3.
Perform the multiplication to find the mass in grams, which will give you the amount of Fe_2O_3 present in 0.500 mole.
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