Final Exam Rev#2 Ch.2
Authored by Cindy Faulk
Chemistry
10th Grade - University
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6 questions
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1.
FILL IN THE BLANK QUESTION
1 min • 1 pt
What is the molecular formula if the empirical formula is CH2O and the molecular molar mass is 180.18?
2.
FILL IN THE BLANK QUESTION
1 min • 1 pt
Given the following: 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula.
3.
FILL IN THE BLANK QUESTION
1 min • 1 pt
A 15.67 g sample of a hydrate of magnesium carbonate was heated to drive off the water. The mass was reduced to 7.58 g. What is the formula of the hydrate?
4.
FILL IN THE BLANK QUESTION
1 min • 1 pt
A 4.175 gram sample of a certain hydrate of copper (II) sulfate, CuSO4•xH2O, is heated until all the water is driven off. The resulting anhydrous compound weighs 3.120 grams. What is the formula of the hydrate?
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A 5.018 gram sample of a certain hydrate of magnesium sulfate, MgSO4•xH2O, is heated until all the water is driven off. The resulting anhydrous compound weighs 2.449 grams. What is the formula of the hydrate?
MgSO4•9H2O
MgSO4•8H2O
MgSO4•7H2O
MgSO4•6H2O
6.
OPEN ENDED QUESTION
3 mins • Ungraded
A 15.67 g sample of a hydrate of magnesium carbonate was heated to drive off the water. The mass was reduced to 7.58 g. What was the % of water in the hydrate?
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