# What is the molecular mass of ""^14CO_2?

Jul 13, 2016

#### Answer:

14+16+16=??"amu"

#### Explanation:

Garden variety carbon dioxide has a mass of 44 amu. Label the carbon to give ""^(14)C and the molecular mass increases by 2 amu. Capisce??

Jul 13, 2016

Mass of one molecule of ${\textcolor{w h i t e}{i}}^{14} {\text{CO}}_{2}$ $= \text{Mass of one atom of" color(white)(i)^14"C}$$+ 2 \times \text{Average atomic mass of Oxygen atom}$
$= 14.003241 + 2 \times 15.9994 = 46.002041$ amu