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0.0200 moles of a compound is found to have a mass of 1.64 g.

Find the formula mass of the compound. Give your answer to 3 significant figures.

Answer :

Answer: 82.0 g/mole

Explanation:

Use the units to see that if we divide 1.64 grams by 0.0200 moles, we'll get a number that is grams/mole, the definition of formula mass.

1.64/0.0200 = 82.0 g/mole (3 sig figs)

We can't tell from this alone what the molecular formula might be, but C6H10 (cyclohexene) comes close (82.1 grams/mole).

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Rewritten by : Barada

The formula mass of the compound will be approximately 82.0 g/mol

The formula mass of the compound is the sum of atomic masses of all the atoms in its chemical formula. It is calculated by adding up the atomic masses of the individual elements in the compound, each multiplied by the subscript indicating the number of atoms of that element in the formula.

To find the formula mass of the compound, we'll use the relationship between moles, mass, and molar mass.

Molar mass (in g/mol) = Mass (in g)/Moles

Given:

Mass = 1.64 g

Moles = 0.0200 moles

Let's plug the values and calculate molar mass:

Molar mass = 1.64 g / 0.0200 moles

Molar mass ≈ 82.0 g/mol

The formula mass of the compound is approximately 82.0 g/mol, rounded to three significant figures.

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