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3. Chemical Reactions

Molecular Formula

3. Chemical Reactions

Molecular Formula

Multiple Choice
Which of the following is NOT a molecular compound?
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Open Question
A compound is 43.7% phosphorus and 56.3% oxygen. The formula mass of the compound is 284 g. calculate the empirical formula and molecular formula of the compound.
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Multiple Choice
A gaseous hydrogen and carbon-containing compound is decomposed and found to contain 82.66% carbon and 17.34% hydrogen by mass. The mass of 158 mL of the gas, measured at 556 mmHg and 25 °C, was found to be 0.275 g. What is the molecular formula of the compound?
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Multiple Choice
Elemental analysis of a pure compound indicated that the compound had 72.2% C, 8.50% H and the remainder as O. If 0.250 moles of the compound weighs 41.55 g, what is the molecular formula of the compound?
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Open Question
A compound containing only sulfur and nitrogen is 69.6% s by mass; the molar mass is 184 g/mol. What are the empirical and molecular formulas of the compound?
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Multiple Choice
Glyceraldehyde (M = 90.078 g/mol), a simple monosaccharide, is comprised of 39.999% C, 6.714% H, and 53.297% oxygen by atomic weight. What would be its molecular formula?
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