Chemistry: What is the percent by mass of oxygen in propanal, ch3ch2cho? (1) 10.0% (3) 38.1% (2) 27.6% (4) 62.1%

What is the percent by mass of oxygen in propanal,

ntrann22

07.01.2022

Answer : The percent by mass of oxygen in propanal is, 27.58 %

Solution : Given,

Molar mass of carbon = 12 g/mole

Molar mass of hydrogen = 1 g/mole

Molar mass of oxygen = 16 g/mole

First we have to calculate the molar mass of propanal, CH_3CH_2CHO

Molar mass of propanal, CH_3CH_2CHO = 3(12)+6(1)+16=58g/mole

Now we have to calculate the percent by mass of oxygen in propanal.

$\text{Percent by mass of oxygen}=\frac{\text{Mass of oxygen}}{\text{Mass of propanal}}\times 100=\frac{16}{58}\times 100=27.58\%$

Therefore, the percent by mass of oxygen in propanal is, 27.58 %

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