Empirical Formulas and Molecular Structures
Flashcard
•
Chemistry
•
10th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is an empirical formula?
Back
An empirical formula is the simplest whole-number ratio of elements in a compound.
2.
FLASHCARD QUESTION
Front
How do you calculate percent by mass of an element in a compound?
Back
Percent by mass = (mass of element in 1 mole of compound / molar mass of compound) x 100%.
3.
FLASHCARD QUESTION
Front
What is the molar mass of MgO?
Back
Molar mass of MgO = 24.31 g/mol (Mg) + 16.00 g/mol (O) = 40.31 g/mol.
4.
FLASHCARD QUESTION
Front
What is the percent by mass of magnesium in MgO?
Back
60%.
5.
FLASHCARD QUESTION
Front
What is the percent composition by mass of sulfur in MgSO4?
Back
26.64%.
6.
FLASHCARD QUESTION
Front
How do you determine which solution is more concentrated?
Back
Concentration = mass of solute / volume of solution. Compare the ratios.
7.
FLASHCARD QUESTION
Front
What is the molar mass of C6H12?
Back
Molar mass of C6H12 = (6 x 12.01 g/mol) + (12 x 1.008 g/mol) = 84.16 g/mol.
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