Final answer:
To calculate the number of moles of H₂O produced from the combustion of 2.0 g of CH₄, we need to find the molar mass of CH₄ and use it to convert the mass of CH₄ to moles. From the balanced equation, we know that for every mole of CH₄, 2 moles of H₂O are produced.
Step-by-step explanation:
First, we need to calculate the molar mass of CH₄. Carbon has a molar mass of 12.01 g/mol and hydrogen has a molar mass of 1.01 g/mol. The molar mass of CH₄ is therefore:
Molar mass of CH₄ = (12.01 g/mol) + 4 * (1.01 g/mol) = 16.05 g/mol
Next, we can use the molar mass of CH₄ to calculate the number of moles in 2.0 g of CH₄ using the formula:
Number of moles = mass / molar mass
Number of moles = 2.0 g / 16.05 g/mol = 0.1245 mol
According to the balanced equation, for every mole of CH₄ combusted, 2 moles of H₄O are produced. Therefore, 0.1245 mol of CH₄ will produce:
Number of moles of H₄O = 0.1245 mol * 2 = 0.249 mol