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PES Skill Sheets.book - Capital High School

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Page 2 of 4<br />

For the following elements and compounds, complete the following table to calculate the mass of one<br />

mole of the substance:<br />

Substance Elements in<br />

substance<br />

Sr<br />

Ne<br />

Ca(OH) 2<br />

NaCl<br />

O 3<br />

C 6H 12O<br />

Atomic<br />

mass of<br />

element<br />

(amu)<br />

The molar mass of a substance can be used to calculate the number of particles (atoms or molecules) present in<br />

any given mass of a substance. You can determine the number of particles present by using the Avogadro<br />

number.<br />

Using the Avogadro number<br />

No. of atoms of<br />

each element<br />

The Avogadro number states that for one mole of any substance, whether element or compound, there are<br />

6.02 × 10 23 particles present in the sample. Those particles are atoms if the substance is an element and<br />

molecules if the substance is a compound. If we look again at our previous examples we see that every substance<br />

has a different molar mass:<br />

14.1<br />

Formula mass (amu) Molar mass<br />

(g)

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