A compound comprising 24 grams of carbon, 2 grams of hydrogen, and 64 grams of oxygen has the empirical formula________?
Show answer Hide answer
Answer: D. CHO2
Explanation
Dividing the given masses by respective atomic weights yields two moles of carbon, two moles of hydrogen, and four moles of oxygen. Simplifying this atomic mole ratio by dividing through by two gives a whole number ratio of one carbon to one hydrogen to two oxygen atoms. The resulting simplest whole number ratio establishes the correct empirical formula as CHO2. Empirical formulas express the simplest whole-number ratio of atoms present in a chemical compound. Calculating moles requires dividing element masses by their standard atomic weights from the periodic table. Elemental analysis data provides the mass percentages needed to determine empirical formulas of unknown substances.
Option A represents a different molecular formula that does not match the simplified elemental mole ratio. Option B suggests a hydrocarbon formula that completely ignores the presence of oxygen and hydrogen proportions. Option C represents formaldehyde derivatives and fails to account for the actual oxygen mole calculations.
Related questions
Q1. The carbon atoms in 1-penten-4-yne exhibit hybridization of_________________?
Show answer Hide answer
Answer: D. sp3 – sp2 – sp
In 1-penten-4-yne, the carbon atoms involved in the alkene double bond exhibit sp3 and sp2 hybridization. The carbon atoms participating in the alkyne triple bond demonstrate characteristic sp hybridization states. Combi...
Q2. When a gas inside a rigid container is heated from 300 K to 600 K, its kinetic energy becomes__________?
Show answer Hide answer
Answer: A. Double
The average kinetic energy of an ideal gas depends solely on its absolute temperature scale. Doubling the Kelvin temperature directly results in a proportional doubling of the average kinetic energy. When the temperature...
Q3. Within a galvanic cell________________?
Show answer Hide answer
Answer: A. Chemical energy is converted into electricity
A galvanic cell harnesses spontaneous chemical redox reactions to generate a continuous flow of electrical current. The potential energy stored in chemical bonds is released and directly converted into electrical energy....
Q4. Moving down a periodic group, ionic radius behaves how ?
Show answer Hide answer
Answer: A. Increases
Moving down a periodic group, new electron shells are successively added to the atomic structure. These additional principal energy levels place outer electrons farther away from the positively charged atomic nucleus. Co...
Q5. Across a period from left to right, electronegativity_________________?
Show answer Hide answer
Answer: A. Increases
Across a period from left to right, electronegativity increases due to a growing effective nuclear charge. A higher number of protons pulls bonding electrons more strongly toward the nucleus across the period. Decreasing...
Q6. Heat changes accompanying physical or chemical transformations at constant pressure are designated as__________________?
Show answer Hide answer
Answer: C. Enthalpy change
Enthalpy change is formally defined as the heat absorbed or released during physical or chemical processes at constant pressure. Most laboratory and industrial reactions occur under constant atmospheric pressure conditio...