# chemistry

How much energy is needed to raise 20.0g H2O from 10.0oC to 75.0oC. The specific heat of water is 4.18 J/gC.

1. 👍
2. 👎
3. 👁
1. to get the heat released or absorbed,
Q = mc(T2-T1)
where
m = mass of substance (units in g)
c = specific heat capacity (units in J/g-K)
T2 = final temperature
T1 = initial temperature
*note: units of temp doesn't matter if it's in degree Celsius or Kelvin, as long as T1 and T2 have the same units (since it's difference in temperature or delta,T)
**note: if Q is (-), heat is released and if (+), heat is absorbed

substituting,
Q = (20.0)(4.18)(75-10)
Q = 5434 J

hope this helps~ :)

1. 👍
2. 👎

## Similar Questions

1. ### physics

- A copper cylinder is initially at 20.0oC. At what temperature will its volume be 0.15% larger than it is at 20.0oC? Take: ƒÒcofficient of thermal expansion of volume for cu= 5.1x10-5 /C

2. ### Chemistry

Lead has a melting point of 327ºC, its specific heat is J/g•deg, and its molar enthalpy of fusion is 4.80 kJ/mol. How much heat, in kilojoules, will be required to heat a 500.0-g sample of lead from 23.0ºC to its melting point

3. ### CHEM

A 5.10-g sample of iron is heated from 36.0oC to 75.0oC. The amount of energy required is 89.54 J. The specific heat capacity of this sample of iron is

4. ### Chemistry

I have this problem: How much heat energy is required to raise the temperature of 0.365kg of copper from 23.0 ∘C to 60.0 ∘C? The specific heat of copper is 0.0920 cal/(g⋅∘C). I did the equation using formula Heat= mass x

1. ### chemistry

* A 50 gram sample of an unknown metal warms from 18 to 58 after absorbing 800 joules of energy. what is the specific heat of the metal? *copper has a specific heat of 0.387 j/g degree celsius. what is the mass of a piece of

2. ### science

In the construction of bridges and skyscrapers, gaps must be left between adjoining steel beams to allow for the expansion and contraction of the metal due to heating and cooling. The temperature of a sample of iron with a mass of

3. ### Physics - calorie

This was my problem: 4.) The specific heat capacity of copper is 0.092 cal/g*oC. Show that the amount of heat needed to raise the temperature of a 10-g piece of copper from 0oC to 100oC is 92 cal. How does this compare with the

4. ### Chemistry Help!

calculate the specific heat of a metallic element if 314 joules of energy are needed to raise the teperature of a 50.0g sample from 25C to 50C. i'm not sure if you use the Q=(s)(m)(delta t) equation or not since it asks for the

1. ### chem

When 72 grams of a metal at 97.0oC is added to 100.0 grams of water at 25oC, the final temperature is 29.1oC. What is the specific heat capacity (in J/g.oC) of the metal?

2. ### Physics

The heat of fusion of water is 80 cal/g. When 25 g of ice at 0ºC is placed in the contents of a 12 oz can of Coke (≈350 g) at 25ºC, what is the final temperature of the beverage?

3. ### Physics

The latent heat of fusion of alcohol is 50 kcal/kg and its melting point is -54oC. It has a specific heat of 0.60 in its liquid state. Calculate the energy needed to melt 2.0 kg of solid alcohol at -54o and raise it to a

4. ### Chemistry

Calculate the heat required to convert 5gm of ice at 0oc into 5gm of steam at 100oc.