What is the mass in grams of .000221 mol of carbon?

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Answer 1 · 2018-07-19T18:10:25

$Mass = 2.652 \times 10^{- 3} g$ $"Mass" = 2.652 xx 10^-3g$

Recall;

$No of moles = \frac{Mass}{Molar Mass}$ $"No of moles" = "Mass"/"Molar Mass"$

Let;

$n = No of moles$ $n = "No of moles"$

$m = Mass$ $m = "Mass"$

$M m = Molar Mass$ $Mm = "Molar Mass"$

Given;

$n = 0.000221 m o l s$ $n = 0.000221mols$

$m = ? g$ $m = ?g$

$M m = 12 g m o l^{- 1}$ $Mm = 12gmol^-1$

$n = \frac{m}{M m}$ $n = m/(Mm)$

Making $m$ $m$ the subject formula;

$m = n \times M m$ $m = n xx Mm$

Plugging in the values;

$m = 0.000221 m o l s \times 12 g m o l^{- 1}$ $m = 0.000221mols xx 12gmol^-1$

$m = 0.000221cancel(mols) xx 12gcancel(mol^-1)$

#m = 0.000221 xx 12g

$m = 0.002652g$

$m = 2.652 xx 10^-3g$

$:. "Mass" = 2.652 xx 10^-3g$