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Questions and Answers
What is the empirical formula for the compound C6H12O6?
What is the empirical formula for the compound C6H12O6?
The empirical formula of a compound is CH2. The molecular formula of this compound could be
The empirical formula of a compound is CH2. The molecular formula of this compound could be
The formula H2O2 is an example of
The formula H2O2 is an example of
What is the gram-formula mass of Ca3(PO4)2?
What is the gram-formula mass of Ca3(PO4)2?
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Which substance has the greatest molecular mass?
Which substance has the greatest molecular mass?
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How many moles of water are contained in 0.250 mole of CuSO4·5H2O?
How many moles of water are contained in 0.250 mole of CuSO4·5H2O?
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What is the total mass in grams of 0.75 mole of SO2?
What is the total mass in grams of 0.75 mole of SO2?
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What is the mass in grams of 1.00 mole of O2 gas?
What is the mass in grams of 1.00 mole of O2 gas?
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What is the total number of atoms of oxygen in the formula Al(ClO3)3?
What is the total number of atoms of oxygen in the formula Al(ClO3)3?
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What is the gram formula mass of Na2CO3·10H2O?
What is the gram formula mass of Na2CO3·10H2O?
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If the empirical formula for an organic compound is CH2O, then the molecular mass of the compound could be?
If the empirical formula for an organic compound is CH2O, then the molecular mass of the compound could be?
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A compound has an empirical formula of CH2 and a molecular mass of 56. What is its molecular formula?
A compound has an empirical formula of CH2 and a molecular mass of 56. What is its molecular formula?
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Which of the following gases has the greatest density at STP?
Which of the following gases has the greatest density at STP?
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A sample of an unknown gas at STP has a density of 1.25 grams per liter. What is the gram molecular mass of this gas?
A sample of an unknown gas at STP has a density of 1.25 grams per liter. What is the gram molecular mass of this gas?
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Study Notes
Empirical and Molecular Formulas
- The empirical formula for C6H12O6 is CH2O.
- If the empirical formula is CH2, the molecular formula could be C2H4, C3H6, C4H8, etc.
Molecular Mass and Formula Mass
- The formula H2O2 is an example of a molecular formula.
- The gram-formula mass of Ca3(PO4)2 is the sum of the atomic masses of calcium, phosphorus, and oxygen.
- The substance with the greatest molecular mass is the one with the largest sum of atomic masses of its constituent atoms.
Moles and Grams
- 0.250 mole of CuSO4·5H2O contains 1.25 moles of water.
- The total mass in grams of 0.75 mole of SO2 is calculated by multiplying the number of moles by the molar mass.
- The mass in grams of 1.00 mole of O2 gas is 32.0 g.
Atoms and Molecules
- The total number of atoms of oxygen in the formula Al(ClO3)3 is 13.
- The gram formula mass of Na2CO3·10H2O is the sum of the atomic masses of sodium, carbon, oxygen, and hydrogen.
Molecular Mass and Empirical Formula
- If the empirical formula is CH2O, the molecular mass could be 30, 60, 90, etc.
- A compound with an empirical formula of CH2 and a molecular mass of 56 has a molecular formula of C4H8.
Gas Density
- The density of a gas at STP is directly proportional to its molecular mass.
- The gas with the greatest density at STP is the one with the largest molecular mass.
- A sample of an unknown gas at STP with a density of 1.25 grams per liter has a gram molecular mass of 44.8 g.
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Description
Test your understanding of stoichiometry with this quiz that covers empirical formulas, molecular formulas, and compound compositions.
