Question #162a7

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Question #162a7

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Answer 1 · 2014-11-25T04:52:42

A mole is a collection that contains $6.02 \cdot 10^{23}$ $6.02 * 10^23$ atoms/ molecules /ions of a substance.

1 mole of $B F_{3}$ $BF_3$ has $6.02 \cdot 10^{23}$ $6.02 * 10^23$ molecules.

To calculate the number of molecules in 1.25 moles of $B F_{3}$ $BF_3$ we will use dimensional analysis.

$1.25$ $1.25$ $moles$ $"moles"$ $B F_{3} \cdot \frac{6.022 \cdot 10^{23} molecules}{1 mol B F_{3}}$ $BF_3 * (6.022 * 10^23" molecules") / ("1 mol "BF_3)$

$1.25 \cdot \frac{6.022 \cdot 10^{23} molecules}{1}$ $1.25 * (6.022 * 10^23 "molecules") / 1$

$7.53 \cdot 10^{23} molecules$ $7.53 * 10^23 "molecules"$ .

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Question #162a7

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