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2 years ago

How much heat has been lost when a 78 g piece of copper is placed into a calorimeter and cools from 120°C to

Chemistry

1 answer:

lora16 [44]2 years ago

3 0

The amount of heat lost by the copper is 2402.4 J.

To Calculate the amount of heat lost, we use the formula below.

<h3>Formula:</h3>

Q = cm(t₂-t₁)................. Equation 1

<h3>Where:</h3>

Q = Amount of heat lost
c = specific heat capacity of copper
m = mass of copper
t₂ = Final temperature
t₁ = Initial temperature

From the question,

<h3>Given:</h3>

m = 78 g
c = 0.385 J/g°C
t₂ = 120°C
t₁ = 40°C

Substitute these values into equation 1.

Q = 78(0.385)(120-40)
Q = 2402.4 J

Hence, The heat lost by the copper is 2402.4 J

Learn more about heat here: brainly.com/question/13439286

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3 years ago

The mass composition of a compound that assists in the coagulation of blood is 76.71% carbon, 7.02% hydrogen, and 16.27% nitroge

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If percentage are given then we are taking total mass is 100 grams.

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Step 1 : convert given masses into moles.

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Moles of N = $\frac{\text{ given mass of N}}{\text{ molar mass of N}}= \frac{16.27g}{14g/mole}=1.16moles$

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The Empirical formula = $C_{11}H_{12}N_2$

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