A compound with a molar mass of 78.0 g/mol is found to contain 92.29% carbon and 7.71% hydrogen, by mass. The molecular formula of the compound is
Answers
Answer:
92.29% of a compound's molecular mass is made up of carbon, and 7.71% is hydrogen.
Therefore, the mass of carbon in that compound is 7892.3/100=72gm, and the mass of hydrogen is 787.7/100=6gm.
Therefore, C6H6 is the molecular formula.
Explanation:
A chemical formula is a way to describe the chemical ratios of the atoms that make up a specific chemical compound or molecule in chemistry. Chemical element symbols, numbers, and occasionally other symbols, such as parentheses, dashes, brackets, commas, and plus (+) and minus () signs, are used to represent the chemical elements. These can only contain one typographic line of symbols, which may also include subscripts and superscripts. A chemical formula has no words and is not the same as the chemical name. A chemical formula does not equal a complete chemical structural formula, despite the fact that it may suggest some basic chemical structures. Chemical formulae are generally less powerful than chemical names and structural formulae, and they can only fully describe the structure of the simplest molecules and chemical substances.
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The compounds with the molecular formula C6H6 have a mass of 92.29% carbon and 7.71% hydrogen and a molar mass of 78.0 gm/mol.
By counting the moles of each element present in a compound and figuring out their relative ratios, it is possible to determine the molecular formula of that compound. The compound's molar mass, which is 78.0 gm/mol, and the percentage of each element present—92.29% carbon and 7.71% hydrogen—are both necessary to determine the molecular formula.
Using the percentage of each element, we can calculate the grams of each element that make up one mole of the compound:
In a compound, carbon makes up 92.29% of the molecular mass and hydrogen makes up 7.71%.
The mass of hydrogen in that compound is 787.7/100=6gm, and the mass of carbon is 7892.3/100=72gm.
As a result, the molecular formula is C6H6.
The compound has a carbon content of 92.29 g per mole
(92.29 g / 1 mole = 92.29 g/12.01 g/mol = 7.69 moles).
Knowing that carbon has a molecular weight of 12, we convert it to an approximate 6 when measuring in moles.
The molecular weight of hydrogen is also 1, so for 6 units, that will be 6.
According to the conclusion, the molecular formula is C6H6.
The compound has a hydrogen content of 7.71 g per mole
(7.71 g / 1 mole = 7.71 g/1.01 g/mol = 7.63 moles)
We must divide the total moles of all the elements in the compound by the smallest total moles of any element to determine the proportion of carbon to hydrogen atoms therein:
1:1 is the ratio of 7.69 moles of carbon to 7.63 moles of hydrogen.
Consequently, one hydrogen atom and one carbon atom make up each mole of the compound. Therefore, the compound's molecular formula is C6H6.
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