Question

O₂ + CO₂ are taken in mass ratio of 3:7 respectively. Find number of molecules of oxygen if 10²⁰ molecules of CO₂ are taken.​

Answer 1

Given mass ratio of O₂ and CO₂ = \(\frac37\)

∴ there number of moles ratio will also = \(\frac37\)

∴ there number of molecules ratio also = \(\frac37\)

Let say number of molecule of O₂ = x

and given number of molecule of CO₂ = 10²⁰

\(\therefore \frac{x}{10^{20}} = \frac37\)

\(x = \frac 37 \times 10^{20}\)

x  = 4.3 x 10¹⁹ molecule of oxygen