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Formula from Chapter 3: definition Avogadro's constant
\(N_{\mathrm{A}} = \dfrac{N_{\mathrm{particle}}}{n_{\mathrm{particle}}}\)
\(n_{\mathrm{\ce{CO2}}}\)
\(= 2.0\ \mathrm{mol}\)
\(N_{\mathrm{A}}\)
\(= 6.022\times 10^{23}\frac{1}{\mathrm{mol}}\)
\(N_{\mathrm{\ce{CO2}}}\)
\(= N_{\mathrm{A}} \cdot n_{\mathrm{\ce{CO2}}}\)
\(\ \ \ =6.022\times 10^{23}\frac{1}{\mathrm{mol}} \cdot 2.0\ \mathrm{mol}\)
\(\ \ \ =1.20\times 10^{24}\)