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Concept explainers
Interpretation:
The percentage composition, molecular formula and empirical formula of the compound have to be given.
Concept Introduction:
Empirical Formula:
The empirical formula of a compound is the simplest whole number ratio of each type of atom in a compound. It can be the same as the compound’s molecular formula but not always. An empirical formula can be calculated from information about the mass of each element in a compound or from the percentage composition.
The steps for determining the empirical formula of a compound as follows:
- Obtain the mass of each element present in grams.
- Determine the number of moles of each atom present.
- Divide the number of moles of each element by the smallest number of moles.
- Convert the numbers to whole numbers. The set of whole numbers are the subscripts in the empirical formula.
Molecular formula:
The molecular formula is the expression of the number of atoms of each element in one molecule of a compound if the molar mass value is known the molecular formula is calculated by the empirical formula.
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Chapter 7 Solutions
Foundations of College Chemistry 15e Binder Ready Version + WileyPLUS Registration Card
- Given that the molar mass of carbon tetrachloride, CCl4 , is 153 g, calculate the mass in grams of 1 molecule of CCl4 .arrow_forwardConsidering your answer to Exercise 79, which type of formula, empirical or molecular, can be obtained from elemental analysis that gives percent composition?arrow_forwardA compound contains arsenic and oxygen as the only elements. A 1.626 g sample of the compound contains 1.232 g of arsenic. From these data, after determining the percent composition, by weight, what is the calculated empirical formula for the compound?arrow_forward
- "How many moles of carbon monoxide (CO) are required to react com- pletely with 1.75 moles of iron (III) oxide (¹23)?" (If this is not the question you see, press New question until it appears.) What unit is given in the question and what quantity is being asked for? A B C D 1.75 mol Fe₂O3 and ? mol CO 1.75 mol CO and ? mol Fe 1.75 mol CO and ? mol CO₂ 1.75 mol Fe₂O3 and ? mol CO₂arrow_forwardA binary compound of carbon and hydrogen has the following percentage composition: 85.63% carbon, 14.37% hydrogen by mass. If the molar mass of the compound is determined by experiment to be between 28 and 29 g/mol, what are the empirical and molecular formulas of the compound? Empirical formula: Molecular formula:arrow_forwardArsenic reacts with oxygen to form a compound AsxOy. If 2.354g of arsenic forms 3.611g of the compound form. What is the empirical formula for the compound?arrow_forward
- (f) A certain pure compound containing element E is analyzed. The elemental composition of the compound is shown in the following table. Determine the empirical formula of the compound using the information in the table. Element Moles Present in the Compound E 0.0676 S 0.0338 0.10arrow_forwardTrichloroethylene (TCE) is a common solvent used to degrease machine parts. Calculate the empirical formula for TCE if the percent composition is 18.25% C, 0.77% H, and 80.99% Cl.arrow_forwardMeasurements show that unknown compound X has the following composition: element mass % carbon 62.6% hydrogen 4.20% |охудen 33.4% Write the empirical chemical formula of X. ?arrow_forward
- Calculate both the empirical and molecular formula for a compound having the following percent composition: 28.01% Mg, 21.57% Si, 1.18% H, and 49.24% O. The molar mass for this compound is 520.80 g/mol.arrow_forwardThe empirical formula of a compound is CH. If themolar mass of this compound is about 78 g, what is itsmolecular formula?arrow_forwardThe percent by mass of silver in Ag,CO3 is %.arrow_forward
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