Answer: 108.09 g
Step-by-step explanation:
The balanced chemical equation for the combustion of methane is:
CH4 + 2O2 → CO2 + 2H2O
From the equation, we can see that 1 mole of CH4 produces 2 moles of H2O.
So, 3 moles of CH4 will produce:
3 moles CH4 × 2 moles H2O / 1 mole CH4 = 6 moles H2O
To find the mass of 6 moles of H2O, we need to use the molar mass of H2O, which is:
2 × (1.008 + 15.999) = 18.015 g/mol
So, the mass of 6 moles of H2O is:
6 moles H2O × 18.015 g/mol = 108.09 g
Therefore, 3 moles of CH4 will produce 108.09 g of H2O.