CH-962

The mole

Chemistry · Secondary 3 · Hard · The mole

A sample of gas contains only molecules of carbon dioxide, CO
y
2
. The mass of the sample is 22.0 g.

(The relative atomic masses are: C = 12, O = 16.)

How many molecules of carbon dioxide are present in the sample?

Take Avogadro’s constant as

6.0 \times 10^{23}

mol

^{-1}

$1.5 \times 10^{23}$
$3.0 \times 10^{23}$
$6.0 \times 10^{23}$
$1.3 \times 10^{24}$

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