
U6 Review
Flashcard
•
Chemistry
•
10th Grade
•
Practice Problem
•
Hard
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16 questions
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1.
FLASHCARD QUESTION
Front
What is the percent by mass of oxygen in MgO?
Back
40%
2.
FLASHCARD QUESTION
Front
How many grams of Fe2O3 are formed when 16.7 g of Fe reacts with excess oxygen? (Balanced equation: 4Fe + 3O2 -> 2Fe2O3)
Back
23.9 g
3.
FLASHCARD QUESTION
Front
How many molecules are in 3.6 grams of sodium chloride (NaCl)? (Molar mass of NaCl = 58.44 g/mol)
Back
3.7 x 10^22 molecules
4.
FLASHCARD QUESTION
Front
What is the percent by mass of oxygen in NO? (Molar mass of NO = 30 g/mol)
Back
53%
5.
FLASHCARD QUESTION
Front
What is the molar mass of C2H4O2? (C: 12 g/mol, H: 1 g/mol, O: 16 g/mol)
Back
60 g/mol
6.
FLASHCARD QUESTION
Front
Define molar mass.
Back
The mass of one mole of a substance, typically expressed in grams per mole (g/mol).
7.
FLASHCARD QUESTION
Front
What is the formula to calculate percent by mass?
Back
(Mass of component / Total mass) x 100%.
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