Q.  In the equation PV = nRT, which one cannot be the numerical value of R? 

1. 8.31 atm K–1 mol–1
2. 8.31 J K–1 mol–1
3. 8.31 × 107 dyne cm K–1 mol–1
4. 8.31 × 107 erg K–1 mol–1-