Podcast
Questions and Answers
H₂O is composed of ______ elements.
H₂O is composed of ______ elements.
2
The total number of atoms in a CO₂ molecule is ______.
The total number of atoms in a CO₂ molecule is ______.
3
The molar mass of H₂O is ______ g/mol.
The molar mass of H₂O is ______ g/mol.
18.016
84.03 g of KCl corresponds to ______ moles.
84.03 g of KCl corresponds to ______ moles.
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The number of molecules in 9.31 g of NO₂ is ______ x 10²³.
The number of molecules in 9.31 g of NO₂ is ______ x 10²³.
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The percent composition of copper in CuBr2 is ______%.
The percent composition of copper in CuBr2 is ______%.
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The molecular formula of trichloroisocyanuric acid is ______.
The molecular formula of trichloroisocyanuric acid is ______.
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A compound with 64.9% carbon and a molecular mass of 148.24 g/mol has the molecular formula ______.
A compound with 64.9% carbon and a molecular mass of 148.24 g/mol has the molecular formula ______.
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To convert 4.8 L of SO3 to moles, the answer is ______ mol.
To convert 4.8 L of SO3 to moles, the answer is ______ mol.
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The mass of 8.34 x 10^24 chromium atoms is ______ g.
The mass of 8.34 x 10^24 chromium atoms is ______ g.
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Study Notes
Chemical Quantities Review
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Problem 1: Determine the number of elements in molecules
- H₂O has 2 elements: Hydrogen (H) and Oxygen (O)
- O₂ has 1 element: Oxygen (O)
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Problem 2: Determine the number of atoms in molecules
- H₂O has 3 atoms: 2 Hydrogen (H) and 1 Oxygen (O)
- O₂ has 2 atoms: 2 Oxygen (O)
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Problem 3: Calculate molar mass
- H₂O: 18.016 g/mol
- CO₂: 44.01 g/mol
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Problem 4: Convert mass to moles
- a. 84.03 g KCl = 1.127 mol
- b. 55.42 g sodium carbonate = 0.5279 mol
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Problem 5: Convert moles to mass
- a. 2.56 mol Br₂ = 409.3 g
- b. 0.567 mol iodine gas = 147.8 g
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Problem 6: Convert mass to molecules
- a. 9.31 g NO₂ = 1.22 x10²³ molecules
- b. 32.81 g lithium nitride = 5.673 x10²² molecules
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Description
Test your knowledge of basic chemistry concepts with this quiz. Questions cover the composition of molecules, molar masses, and calculations related to moles and atoms. Perfect for revising essential chemistry topics!
