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How many joules are in 4kcal?
The conversion is 4.2 Joules per calorie, so 4 kcal is 16.8 kJ.
How is the energy value of food measure?
Joules (J) or kilocalories (cal) (kcal in Europe)
How many kilo joules in 3280 kilo calories?
3280 kcal = 13,730 kJ
What are the energy formulas involving specific heat mass and temperature change?
E = mass x sp ht x Δ°t (Finding Energy)where E (Energy) or Q (Quantity of Heat), mass (g), sp ht (aka specific heat, J/g°C*[typical] or cal/g°C or kcal/g°C), and Δ°t (temperature change). Finding Temperature ChangeDivide energy by mass multiplied by specific heat. Δ°t = Energy-- Mass * sp htIn order to find the final temperature (if problem is asking for this), add or subtract the original temperature and the new temperature together.Tf = original temperature +/- new temperatureIf energy is added, the temperatures will be added together; if energy is removed, the temperatures will be subtracted.Finding MassDivide energy by specific heat multiplied by temperature change. Mass = Energy------- sp ht * Δ°tFinding Specific HeatDivide energy by mass multiplied by temperature change. Sp ht = Energy------- Mass * Δ°tConverting Form of Energy (joules, kcal, and cal)Sometimes a problem will have E be shown in cal/g°C or kcal/g°C but will be asking for Joules or even vice versa. This means a conversion has to take place. Cal --> Joules and Joules --> cal-Calories (Cal) --> Joules (J)Multiply # cal by 4.184 Joules (J).Conversion Factor# cal x 4.184 J = Joules---------- 1 cal1 cal = 4.184 Joules-Joules (J) --> Calories (Cal)Divide # Joules (J) by 4.184Conversion Factor# J x 1 cal = cal--- 4.184 J1 Joule = 0.239005736 calKcal --> Joules (J) and Joules (J) --> Kcal-Joules --> kcal (Joules --> cal --> kcal)Divide # J by # kcal multiplied by 103Conversion Factor# Joules x 1 cal - * - 1kcal = kcal---------- 4.184J -- 103 cal1 kcal = 4,184 Joules 1 Joule = 0.000239005736 kcal-Kcal --> Joules (J) (Kcal --> cal --> Joules)Multiply # kcal by 103 cal by 4.184JConversion Factor# kcal * 103 cal * 4.184J = Joules (J)----------- 1 kcal --- 1 calAnother relationship that is good to understand: 1 kcal = 1000 (103) cal 1 cal = 0.001 (10-3) kcal
If the kcal is 185 what is it in calories?
184,999.99989344 in 185 kcals 1 joule = 0.239005736 calories 1 kilocalorie (kcal) = 4184 joules 185kl x 4184 Joules x 0.239005736 calories = 184,999.99989344
How many joules are absorbed by the water with a mass of 0.5 kg in order to raise the temperature from 30 to 65?
1 joule = 2.39 X 10-4 kcal 65-30 = 35 degrees 1 kcal = 1 degree kg 35 degrees X 0.5 kg / 2.39 X 10-4 kcal/joulle = 73222 joules
Are kilo joules and kcal the same thing?
no, that's a conversion factor of 4.184
How many calories are in 1 kcal?
1 calorie is 4.1868 joules. This is referred to (or was when I was at school a long time ago) as the 'mechanical equivalent of heat' and is worth remembering, you can say 4.2 joules to a good approximation. So 1 kcal = 4,186.8 joules or 4.1868 kjoules if you prefer
How do you convert 750kcal to joules?
We searched on-line for about 4 seconds and found a conversion factor:1 Kcal = 4186.8 joules (rounded)That's all we need. Now all we have to do is multiply both sides of the equation by 750:750 Kcal = (750) x (4186.8) = 3,140,100 joules (rounded)
Is 3.25kcal the same amount of energy as 3.25jouls?
No, to convert from cal. to joules 1 cal. = 4.18400 joules , then 1KCal = (4.18400 *10^-3) joules so 3.25 kcal doesn't equal 3.25 Joules
What is kcal?
1 kcal equal 1 000 calories or 4,184 joules. 1 calorie is equal to the heat needed to increase the temperature of 1 g water with 1 0C.
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
