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The amount of energy to boil water depends on two things: the amount of water and the temperature of the water when you start.

The more water water, the more energy it takes. The colder the water, the more energy it takes.

Let say the water is at room temperature, or 20 °C. First, the water must be heated to 100 °C, which takes energy. The amount of energy is given by the specific heat of water, which is 4.186 Joule/gram °C. That means that requires 4.186 Joules of energy to heat 1 kilogram of water by 1 °C. So if you have 1 kilo grams of water at 20 °C, you have to add this much energy:

= (4.18Joule/gram °C) (100g) (100 °C - 20 °C)

= 334400 joules/°C

Of course, if you had more or less water, or it was colder or warmer, you would adjust this equation accordingly..

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Q: How much energy is needed to boil water?

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It depends on the starting temperature.

Water doesn't boil until 216 degrees. So any amount of energy won't work at 100 degrees

No, it requires much more energy to boil water than to melt the same mass of ice (around 7 times as much).

From 22 degrees room temperature in a perfect world in a vacum, 3276kJ. Pure water From 22 degrees room temperature in a perfect world in a vacum, 3276kJ. Pure water

Depends how much water and the temperature of the water. To heat 1 mL of water by 1 degree C 1 cal of energy (4.184 Joules) is required. Assuming that the water is at 25 degrees C, to boil one litre (liter) of water you would require 75,000 cal or 313.8 kJ. Or 16.74 g of mars bar ;). In terms of solar energy a 180 watt solar panel would take just under half an hour to gather enough energy to boil a litre of water from 25 degrees C (provided it's receiving maximum sunlight of course.

Until now, conveniently measuring the correct amount of water to be boiled in your kettle has not been easy. It is estimated that, on average, we boil twice the volume of water needed every time. Which means twice as much energy, twice as much time. An eco kettle allows you to boil just the right amount of water every time.

Specific heat capacity water - 4.187 kJ/kgK4.187 kJ/kgK * 10'K * 1Kg = 41.87 Kj

The energy required to boil water will depend upon the starting temperature of the water, your location above or below sea level, and the mass of water being boiled. This is because the boiling point of a substance is when its vapor pressure equals the pressure surrounding the liquid.

The needed energy is 10 calories.

I boil about 4 cups water.

none

10

100 mL × × × 40.65 kJ/mol = 226 kJ

it takes 1589kj to freeze water that is at 15 degrees Celsius

The value of energy is:H = 50 x 4,179 x (100 - T1)T1 is the initial temperature of water.

depending on how much is in it, if not much salt is in it it will take about the same as normal water if a lot is in it it will boil faster

The needed energy at 100 oC is 48751 MJ.

If the water is at 100 degrees Celsius, then it has already reached boiling point.If you meant to ask how much energy is needed to vaporize (turn from liquid to gas) the water, do the following:1. convert grams to moles of water45.00 grams H20 x mol/18.016 grams = 2.50 mol H2O2. find needed kJ using the heat of vaporization conversion factor.2.50 mol x 40.6 kJ/mol H20 = 102 kJ are needed to convert 45.0 grams of liquid water to vapor.

It boils at 170° F

A 300 grams of water takes about 90 seconds to boil in a 2 kW kettle, so that is 2000 watts x 90 seconds which is 180,000 Joules of energy. But to convert that water completely into steam requires an extra 300x550x4.2 Joules, which is nearly 700,000 Joules. So converting it to steam takes 4-5 times as much energy as boiling it. That is why it takes a while for a kettle to boil dry.

Assuming the initial temperature of the water is not greater than 85Â°, the energy needed is 150 calories.

this is somewhat a guess but somehow reducing the pressure will cause it to boil at a lower temperature because the molecules will be closer together and not need as much energy to collide... this is somewhat a guess but somehow reducing the pressure will cause it to boil at a lower temperature because the molecules will be closer together and not need as much energy to collide...

Boil your water. Use 4 cups water to 1 cup sugar. A little more is ok too. No color is needed.

Boil your water. Use 4 cups water to 1 cup sugar. A little more is ok too. No color is needed.

The specific heat of water determines how much energy is needed to heat water.

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