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skad [1K]
3 years ago
13

Calculate the amount of heat required to heat a 3.3 kg gold bar from 26 ∘C to 69 ∘C. Specific heat capacity of gold is 0.128 J/g

∘C.
Chemistry
2 answers:
kaheart [24]3 years ago
6 0
To answer the question above, we make use of the equation,
                          heat = (specific heat ) x mass x (change in temperature)
Substituting the known values,
                       heat = (0.128 J/g°C) x (3.3 kg)(1000g / 1kg) x (69°C - 26°C)
                               = 18163.2 J
Therefore, the amount of heat required is approximately 18163.2 J. 
Olin [163]3 years ago
6 0

Answer:

We need 18.2 kJ of heat

Explanation:

Step 1: Data given

Mass of gold = 3.3 kg = 3300 grams

Initial temperature = 26.0 °C

Final temperature = 69.0 °C

Specific heat of gold = 0.128 J/g°C

Step 2: Calculate the heat

Q = m*c*ΔT

⇒ with Q = the heat transfered = TO BE DETERMINED

⇒ with m = the mass of gold = 3300 grams

⇒ with c = the specific heat of gold = 0.128 J/g°C

⇒ with ΔT = The change in temperature = T2 - T1 = 69.0 - 26.0 = 43.0 °C

Q = 3300g * 0.128 J/g°C * 43.0 °C

Q = 18163 J = 18.2 kJ

We need 18.2 kJ of heat

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A gas has a pressure of 450 mmHg at 100 degrees Celsius. What will its new pressure be when the temperature rises 200 degrees Ce
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Answer:

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Explanation:

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Initial temperature = 100°C

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Final pressure, P2 = 900 mmHg.

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