Question

CALCULATOR

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D) SPEAK OPTIONS
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Do) 17. A compound containins 27.3 grams of carbon and 72.7 grams of oxygen. Which
of the following is a possible molecular formula?
D
CLE

Answer 1

Answer: The possible molecular formula will be
`CO_2`

Step-by-step explanation:

Mass of C= 27.3 g

Mass of O = 72.7 g

Step 1 : convert given masses into moles.

Moles of C =
`\frac{\text{ given mass of C}}{\text{ molar mass of C}}= (27.3g)/(12g/mole)=2.275moles`

Moles of O =
`\frac{\text{ given mass of O}}{\text{ molar mass of O}}= (72.7g)/(16g/mole)=4.544moles`

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For C =
`(2.275)/(2.275)=1`

For O =
`(4.544)/(2.275)=2`

The ratio of C : O = 1: 2

Hence the empirical formula is
`CO_2`

The possible molecular formula will be=
`n* CO_2`