Answer:
Explanation:
1) Convert the mass of water into number of moles
- Molar mass of water: 18.015 g/mol
- Number of moles, n = mass in grams / molar mass
n = 255 g / 18.015 g/mol = 14.15 mol
2) Use the formula E = n × ΔH vap
This is, you have to multiply the molar ΔH vaporization by the number of moles to find the total energy to boil the given amount of water.
- E = 14.15 mol × 40,650 J/mol = 575,395.5 J
3) Round to the correct number of significant figures.
The mass of water is the measurement with the least number of significant figures (3), so you must report the answer with 3 significant figures,
