ECA Review
Authored by Mercedita Ampong
Chemistry
10th Grade
Used 4+ times
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12 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 2 pts
Calculate the number of moles in 2.46 × 10²¹ molecules of CO₂.
2.
MULTIPLE CHOICE QUESTION
30 sec • 2 pts
Calculate the molar mass of (NH₄)₂C₂O₄. .
3.
MULTIPLE CHOICE QUESTION
30 sec • 2 pts
A gaseous hydrocarbon has a density of 2.59 g/L at STP. What is the identity of the hydrocarbon?
4.
MULTIPLE CHOICE QUESTION
30 sec • 2 pts
What is the percent composition of PbO₂?
5.
MULTIPLE CHOICE QUESTION
30 sec • 2 pts
A compound is analyzed and found to have the percent composition shown in the pie chart. What is the empirical formula for this compound?
6.
MULTIPLE CHOICE QUESTION
30 sec • 2 pts
What is the molarity when 4.24 mol of NaCl is prepared in 2.00 L of solution?
7.
MULTIPLE CHOICE QUESTION
30 sec • 2 pts
What is the molarity of a solution that contains 78.5 g of copper(II) chloride in 1.50 L of solution?
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