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Formula from Chapter 4: Counting atoms in formula or chemical equation
\(N_{\mathrm{atoms}} = \mathrm{coeff} \cdot \mathrm{subscript}\)
\(\ce{ 2 NH3}\)
\(\mathrm{coeff}\)
\(= 2\)
\(\mathrm{subscript}\)
\(= 2\)
\(N_{\mathrm{H}}\)
\(= \mathrm{coeff} \cdot \mathrm{subscript}\)
\(\ \ \ =2 \cdot 2\)
\(\ \ \ =4\)