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Short answer: 2kcal
To be preceise, it depends on the temperature of the water, because the heat capacity of a substance changes with temperature. But in a practical sense, that doesn't matter, because the change is usually very small.
If we know the definition of a calorie, it's actually quite easy to calculate this. 1 calorie is the amount of energy required to increase the temperature of 1g of water by 1C. What we need to do is just play with the definition so that it fits with our numbers. So to raise 100g of water with 20C, we need 1cal*C-1*g-1*100g*20C = 2000 cal = 2 kcal (1 kcal = 1 kilocalorie = 1000 cal)
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How much energy is in a fatglucose and protein?
Fats: 9.3 kcal/gm Glucose/ carbohydrates: 4.2 kcal/gm Proteins: 5 kcal/gm
How many grams of water could be heated from 25 degrees Celsius to 100 degrees Celsius upon absorption of 4.22 kcal of heat?
E = mass x specific heat x Δ°t (temperature change)------------------ Energyspecific heat * temperature change = massΔ°t = new temperature - original temperatureIn order to calculate the mass of water able to be heated, we must divide the given energy by the result of specific heat times temperature change. Before proceeding to do such, we must calculate the temperature change, as well as convert cal to joules. It is also important to know that water's specific heat is 4.184 J/g°C.1. Calculate temperature change.Δ°t = 100°C-25°CΔ°t= 75°C2. Convert kcal to joules (multiply kcal * 103 * 4.184 joules [J]). (kcal --> joules)Joules = 4.22 kcal x 103 cal x 4.184 J/g°C = 17656.48 Joules------------------------ 1 kcal ------ 1 cal3. Find mass.Mass = 17656.48J(4.184J/g°C * 75°C) = 56.3g
Is the amount of energy that food contains measured in calories?
Yes, the amount of energy that food contains is measured in calories. When we refer to calories in the context of food, we are actually referring to kilocalories (kcal), which represent the amount of energy needed to raise the temperature of 1 kilogram of water by 1 degree Celsius.
What is kcal used to measure?
kcal is used to measure energy in the form of food calories. It indicates the amount of energy that a particular food or beverage provides when consumed.
How much energy is available at each level of an energy pyramid?
The Producers get 1,000 kcal, the First-Level consumers get 100 kcal, Second-level consumers get 10 kcal and Third level gets 1 kcal.
