Question

calculated the mass of 12.044×10²⁵ molecules of oxygen​

Answer 1

Answer:

$12.044$×$10^{25}$  molecules of oxygen​

Mass of $6.022$×$10^{23}$ molecules of oxygen​ = 32g

Mass of one molecule of oxygen​=$\frac{32}{6.022*10^{23} }$=$5.3$×$10^{-23} g$

Mass of $12.044$×$10^{25}$ molecules of oxygen​ = $5.3$×$10^{-23}$×$12.044$×$10^{25}$ g= 6400g or 6.4kg

Hence the mass of 12.044×10²⁵ molecules of oxygen​ is 6.4kg.