Question

how many molecules are in 0.8 moles of no2?
? × 10^? molecules of no2
remember: 1 mole = 6.02 × 10^23 molecules
enter the coefficient in the green box and the exponent in the yellow box.

Explanation:

Step1: Use the conversion factor

We know that \(1\) mole \( = 6.02\times10^{23}\) molecules. For \(0.8\) moles of \(NO_2\), we multiply the number of moles by Avogadro's number (\(6.02\times 10^{23}\)).
The formula is \(N=n\times N_A\), where \(n = 0.8\) (moles) and \(N_A=6.02\times 10^{23}\) (molecules/mole).
So, \(N = 0.8\times6.02\times 10^{23}\).

Step2: Calculate the coefficient

\(0.8\times6.02=4.816\).
We can write \(4.816\times 10^{23}\) in scientific - notation.

Answer:

Coefficient: \(4.816\), Exponent: \(23\)