Multiple Choice
In volumetric analysis, what is the process of analyzing a smaller, representative portion of a sample cube called?
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1. Chemical Measurements
Volumetric Analysis
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Determine the number of mmoles of sulfuric acid that would be found within a 120 g sample that is 79.9% sulfuric acid.
A
0.960 mmol
B
980 mmol
C
0.33 mmol
D
1.7 mmol
Verified step by step guidance1
Step 1: Understand the problem. We need to find the number of millimoles (mmol) of sulfuric acid (H₂SO₄) in a 120 g sample that is 79.9% sulfuric acid by mass.
Step 2: Calculate the mass of sulfuric acid in the sample. Multiply the total mass of the sample (120 g) by the percentage of sulfuric acid (79.9%) to find the mass of sulfuric acid.
Step 3: Convert the mass of sulfuric acid to moles. Use the molar mass of sulfuric acid (H₂SO₄), which is approximately 98.08 g/mol, to convert the mass of sulfuric acid to moles.
Step 4: Convert moles to millimoles. Since 1 mole is equal to 1000 millimoles, multiply the number of moles by 1000 to convert to millimoles.
Step 5: Review the calculation steps to ensure accuracy and verify that the units are consistent throughout the process.
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