Question
How many molecules of water are present in 7.8 moles of water? (1 point) Responses 7.8 x 1023 molecules 7.8 x 1023 molecules 4.69 molcules 4.69 molcules 6.022×1023 molecules 6.022×1023 molecules 4.7 x 1024 molecules
Answers
To find the number of molecules in 7.8 moles of water, you can use Avogadro's number, which states that one mole of any substance contains approximately \(6.022 \times 10^{23}\) molecules.
To calculate the number of molecules in 7.8 moles, you use the following formula:
\[
\text{Number of molecules} = \text{Number of moles} \times \text{Avogadro's number}
\]
\[
\text{Number of molecules} = 7.8 \, \text{moles} \times 6.022 \times 10^{23} \, \text{molecules/mole}
\]
\[
\text{Number of molecules} \approx 4.69 \times 10^{24} \, \text{molecules}
\]
From the options given, \(4.7 \times 10^{24}\) molecules is the closest correct response.
To calculate the number of molecules in 7.8 moles, you use the following formula:
\[
\text{Number of molecules} = \text{Number of moles} \times \text{Avogadro's number}
\]
\[
\text{Number of molecules} = 7.8 \, \text{moles} \times 6.022 \times 10^{23} \, \text{molecules/mole}
\]
\[
\text{Number of molecules} \approx 4.69 \times 10^{24} \, \text{molecules}
\]
From the options given, \(4.7 \times 10^{24}\) molecules is the closest correct response.