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Norma-Jean [14]
3 years ago
12

How many joules of heat are absorbed when 73 g water are heated from 30*C to 43*C? *

Chemistry
2 answers:
stepladder [879]3 years ago
6 0

Answer:

3966.82 J

Explanation:

q=sm∆T

q=73×13×4.18

the specific heat for water is 4.18

zysi [14]3 years ago
6 0

Answer:

\boxed {\boxed {\sf 39,668.2 \  Joules}}

Explanation:

We are given the mass and change in temperature, so we must use this formula for heat energy:

q=mc \Delta T

The mass is 73 grams. Water's specific heat is 4.18 J/g × °C. Let's calculate the change in temperature

  • ΔT= final temperature - initial temperature
  • ΔT= 43 °C - 30°C
  • ΔT= 13 °C

Now we know all the variables and can substitute them into the formula.

m= 73 \ g \\c= 4.18 \ J/g* \textdegree C \\\Delta T= 13 \ \textdegree C

q= (73 \ g )(4.18 \ J/g*\textdegree C)(13 \textdegree C)

Multiply the first numbers together. The grams will cancel.

q= 3051.4 \ J/\textdegree C (13 \textdegree C)

Multiply again. This time, the degrees Celsius cancel.

q= 39668.2 \ J

<u>39,668.2 Joules</u> of heat energy are absorbed.

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The reaction equation is;

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0.01875 moles of barium chloride yields 3 × 0.01875 moles/3 = 0.01875 moles of barium sulphate

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