Multiple Choice
Which of the following is the molar mass of acetic acid (CH3COOH)?
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2. Atoms & Elements
Calculating Molar Mass
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
You need 2.5 mol of iron (Fe) for an experiment. How many grams of iron must you measure out?
A
139.5 g
B
112.0 g
C
55.8 g
D
140 g
Verified step by step guidance1
Identify the given information: you need 2.5 moles of iron (Fe).
Recall the molar mass of iron (Fe), which is the mass of one mole of Fe atoms. The molar mass of Fe is approximately 55.8 g/mol.
Use the formula to convert moles to grams: \(\\text{mass (g)} = \\text{moles} \\times \\text{molar mass (g/mol)}\).
Substitute the known values into the formula: \(\\text{mass} = 2.5 \\text{ mol} \\times 55.8 \\text{ g/mol}\).
Calculate the product to find the mass of iron needed in grams.
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