Question 18 Convert 6.7 moles of beryllium oxide to molecules. Answer: square times 10 square power. 14 pts

To convert moles to molecules, we need to use Avogadro's number, which is \(6.022 \times 10^{23}\) molecules per mole.<br /><br />Given:<br />- 6.7 moles of beryllium oxide (BeO)<br /><br />We can use the following formula:<br />\[ \text{Number of molecules} = \text{moles} \times \text{Avogadro's number} \]<br /><br />Substitute the given values:<br />\[ \text{Number of molecules} = 6.7 \, \text{moles} \times 6.022 \times 10^{23} \, \text{molecules/mole} \]<br /><br />Now, perform the multiplication:<br />\[ \text{Number of molecules} = 6.7 \times 6.022 \times 10^{23} \]<br />\[ \text{Number of molecules} = 40.3454 \times 10^{23} \]<br /><br />To express this in scientific notation:<br />\[ \text{Number of molecules} = 4.03454 \times^{24} \]<br /><br />Rounding to three significant figures:<br />\[ \text{Number of molecules} = 4.03 \times 10^{24} \]<br /><br />So, the answer is:<br />\[ 4.03 \times 10^{24} \, \text{molecules} \]