Question

The number of oxygen molecules required for the complete combustion of 5 moles of methane is_______.

• A. $6.023\times {10}^{24}$ molecules
• B. $3.011\times {10}^{23}$ molecules
• C. $1.5023\times {10}^{24}$ molecules
• D. $6.023\times {10}^{23}$ molecules

Answer 1

The correct option is A $6.023\times {10}^{24}$ molecules

Reaction:
$C{H}_{4\left(g\right)}$+$2O_{2\left(g\right)}\to C{O}_{2\left(g\right)}+2H_{2}O\left(g\right)$
1 2
5 10 mole
So for complete combustion of 5 moles of methane, 10 moles of oxygen required.
oxygen molecules $6.023\times {10}^{23}\times 10=6.023\times {10}^{24}$.