Calculate the mass of 100 molecules of oxygen | vedclass

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Question

(A) Step $1$: Calculate the mass in $amu$ (or $u$).The molar mass of $O_2$ is $32 	ext{ g/mol}$. The mass of one molecule of $O_2$ is $32 	ext{ u}$.

Vedclass · Accepted Answer

$3200 	ext{ u}$ and $5.314 	imes 10^{-21} 	ext{ g}$

Vedclass · Answer

(A) Step $1$: Calculate the mass in $amu$ (or $u$).The molar mass of $O_2$ is $32 	ext{ g/mol}$. The mass of one molecule of $O_2$ is $32 	ext{ u}$.Mass of $100$ molecules $= 100 	imes 32 	ext{ u} = 3200 	ext{ u}$.Step $2$: Calculate the mass in grams.Mass of one molecule of $O_2 = \frac{32 	ext{ g}}{6.022 	imes 10^{23}} \approx 5.314 	imes 10^{-23} 	ext{ g}$.Mass of $100$ molecules $= 100 	imes 5.314 	imes 10^{-23} 	ext{ g} = 5.314 	imes 10^{-21} 	ext{ g}$.

Calculate the mass of $100$ molecules of oxygen $(O_2)$ in $amu$ and in grams.

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