the heat of vaporization of water is 2.26kJ/g. how much heat is needed to change 2.55 g of water to steam?
2.26 kJ/g x 2.55g = ?
To find the amount of heat needed to change water to steam, you can use the equation:
Heat = mass × heat of vaporization
First, we need to convert the mass of water from grams to kilograms.
1 kilogram = 1000 grams
Therefore, 2.55 grams is equal to 2.55 / 1000 = 0.00255 kilograms.
Now we can calculate the heat required:
Heat = 0.00255 kg × 2.26 kJ/g
The unit "grams" cancels out, leaving us with:
Heat = 0.00255 kg × 2.26 kJ/kg
Finally, multiply the two numbers:
Heat = 0.00255 kg × 2.26 kJ/kg = 0.0057675 kJ
Therefore, approximately 0.0058 kilojoules (kJ) of heat is needed to change 2.55 grams of water to steam.