Chapter 19: Q. 15 (page 543)

How much heat is needed to change 20 g of mercury at $20 ° C$
into mercury vapor at the boiling point?

Short Answer

Expert verified

The answer is $Q = 6.8 k J$

Step by step solution

Total Heat of Mercury

Temperature Change of Mercury is at the initial level of $20 ° C$ and the maximum level of temperature is $357 ° C$ .

Here, $Q_{1}$ is Temperature Change and $Q_{2}$ is phase change

Therefore, the total heat is

$Q = Q_{1} + Q_{2}$

Also, $Q_{1} = M c ∆ T$

Thus,

role="math" localid="1649083560585" $\begin{array}{rcl} Q_{1} & = & M c (T_{2} - T_{1}) \\ = & 0.944 \times 10^{3} J \\ = & 0.944 k J \end{array}$

On the other hand, $Q_{2} = M L_{v}$

Calculation of Result

Here $L_{v}$ is Heat of Vaporization

Thus, $Q_{2} = M L_{v} = 5.92 \times 10^{3} J = 5.9 k J$

Now,

$\begin{array}{rcl} Q & = & Q_{1} + Q_{2} \\ = & 0.9 k J + 5.9 k J \\ = & 6.8 k J \end{array}$

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How much heat is needed to change 20 g of mercury at $20 ° C$
into mercury vapor at the boiling point?

Short Answer

Step by step solution

Total Heat of Mercury

Calculation of Result

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How much heat is needed to change 20 g of mercury at20°Cinto mercury vapor at the boiling point?

Short Answer

Step by step solution

Total Heat of Mercury

Calculation of Result

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Physics Textbooks

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How much heat is needed to change 20 g of mercury at $20 ° C$
into mercury vapor at the boiling point?