객관식
An unknown compound contains only carbon, hydrogen, and chlorine. Using combustion analysis, you burned 22.56 mg of the sample and collected 7.11 mg of H2O and 52.93 mg of CO2. What is the empirical formula of this compound?
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3. Chemical Reactions
Empirical Formula
Multiple Choice
Which of the following methods can be used to determine the empirical formula of zinc oxide?
A
Mixing zinc with sulfuric acid and measuring the temperature change
B
Dissolving zinc in water and measuring the pH change
C
Heating zinc in a vacuum and measuring the volume change
D
Combining zinc with oxygen and measuring the mass change
검증된 단계별 안내1
Understand that the empirical formula represents the simplest whole-number ratio of elements in a compound. For zinc oxide, we need to determine the ratio of zinc (Zn) to oxygen (O) in the compound.
Recognize that the empirical formula can be determined by measuring the mass of each element in the compound. In this case, we need to measure the mass of zinc and the mass of oxygen that combine to form zinc oxide.
Consider the method of combining zinc with oxygen and measuring the mass change. This involves heating zinc in the presence of oxygen and measuring the mass before and after the reaction to determine how much oxygen has combined with the zinc.
Calculate the mass of oxygen that has reacted by subtracting the initial mass of zinc from the final mass of the zinc oxide product. This gives the mass of oxygen that has combined with the zinc.
Use the masses of zinc and oxygen to calculate the mole ratio. Convert the masses to moles using the molar masses of zinc and oxygen, and then determine the simplest whole-number ratio to find the empirical formula of zinc oxide.
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