How much energy does it take to boil a 125g sample of water?

I w ñ 5.26g 110 . ——- – —— Page 5 8. How much energy does it take to boil a 125 g sample of water? (AHvap for water = R257 J/g) q=? m=125g A trap=-2257] q=maltrap q= 125g (22573) } q=282125 J=(282000) .

How much energy does it take to boil water?

At 1 atm, water freezes at 0° C and boils at 100° C. The energy required to change water from a liquid to a solid is 333.7 kJ/kg while the energy required to boil water is 2257 kJ/kg.

How much energy does it take to boil 100g of this water?

So 100ml of water has a mass of 100 grams. The change in temperature is (100°C – 27°C) = 73°C. Since the specific heat of water is 4.18J/g/°C we can calculate the amount of energy needed by the expression below. Energy required = 4.18 J/g/°C X 100g X 73°C = 30.514KJ.

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How do you calculate the energy needed to heat water?

The specific heat capacity of water is 4.18 J/g/°C. We wish to determine the value of Q – the quantity of heat. To do so, we would use the equation Q = m•C•ΔT. The m and the C are known; the ΔT can be determined from the initial and final temperature.

How much energy does it take to boil 500g of water at its boiling point?

In other words, when a substance changes its phase, the temperature remains constant. Where Q is the heat (J), m is the mass (g) and L is the latent heat (J/g). Hence, 1115 kJ of heat is needed to vaporize 500 g of water at its boiling point.

Is it cheaper to boil water with gas or electric?

Based on the above answers and examples, to boil 1 litre of water from 20C to 100C, requiring 0.183 kWh of either electricity or gas, at todays energy prices GAS is 68% cheaper than electricity.

How much energy is required to boil 150g water?

25 degrees Celsius is 298 degrees Kelvin; 100 degrees Celsius, 373 degrees Kelvin. = 150 g x 4.184 J/g/K x (373 – 298) K = 47,070 J. Thus, 47,070 J are needed to increase the temperature of 150 g of water from 25 degrees C to its boiling point of 100 degrees C.

Why is energy needed to boil water?

1 Answer. Boiling water is an endothermic process, which supplies heat to the water molecules, increasing their potential energy. … Once the intermolecular bonds are broken, any extra heat increases the kinetic energy of the system and the molecules of the water vapor move faster as the temperature increases.

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When a liquid is vaporized how much energy is gained?

The temperature of the substance does not change during vaporization. However, the substance absorbs thermal energy. Explanation: When Liquid is vaporized it gains energy by 20%.

How much energy does it take to boil a gallon of water?

Water weighs 8.33 pounds per gallon so we can calculate that one gallon of water requires 8.33 BTU to raise the temperature 1ºF.

How many watts of power would it take to heat 1l of water?

It takes 4.2 kJ to heat a kilogram of water by one degree so 100 degrees needs 420 kJ. 5 minutes is 300 seconds so if you divide those you get 420 kJ / 300 s = 1.4 kW. This of course is 100% efficacy. In reality you may need more like 2 kW.

How much does it cost to heat 1 Litre of water?

It takes about 1/10 kWh of energy to boil a litre of water and around 5kWh to heat a bath. If using electric it’s near enough 100% energy conversion from energy paid for to heat, but leccie is more expensive than gas per kWh (see bills).

How do we calculate energy?

In classical mechanics, kinetic energy (KE) is equal to half of an object’s mass (1/2*m) multiplied by the velocity squared. For example, if a an object with a mass of 10 kg (m = 10 kg) is moving at a velocity of 5 meters per second (v = 5 m/s), the kinetic energy is equal to 125 Joules, or (1/2 * 10 kg) * 5 m/s2.

How many joules does it take to boil 1 gram of water?

The specific heat of water is 1 calorie/gram °C = 4.186 joule/gram °C which is higher than any other common substance. As a result, water plays a very important role in temperature regulation. The specific heat per gram for water is much higher than that for a metal, as described in the water-metal example.

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How long does it take to boil 1 liter of water?

It will take about 8 to 10 minutes to bring 4 cups (1 liter) of water to a boil, depending on the stove. Usually, it’s 2 minutes per cup of water, depending on the stove. On a propane stove, it takes 8 minutes to boil 4 cups (1 liter) of water.

How many joules does it take to heat up water?

Precisely, water has to absorb 4,184 Joules of heat (1 calorie) for the temperature of one kilogram of water to increase 1°C. For comparison sake, it only takes 385 Joules of heat to raise 1 kilogram of copper 1°C.

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