contestada

Steam at 100°C is added to ice at 0°C. Find the temperature when the mass of steam is 10 g and
the mass of ice is 50 g. The specific heat of water is 4186 J/kg°C, its latent heat of fusion is 3.33x105 J/kg and its heat of vaporization is 2.26x106 J/kg.

Respuesta :

Answer:

[tex]40.4^{\circ}C[/tex]

Explanation:

First of all, we have to calculate the heat released by the steam whem it turns into liquid water. This is given by:

[tex]Q_s = m_s \lambda_v[/tex]

where

[tex]m_s = 10 g=0.010kg[/tex] is the mass of steam

[tex]\lambda_v=2.26\cdot 10^6 J/kg[/tex] is the latent heat of vaporization

Substituting,

[tex]Q_s=(0.010)(2.26\cdot 10^6)=22,600 J[/tex]

Now we find the heat absorbed by the ice when it turns into liquid water:

[tex]Q_i=m_i \lambda_f[/tex]

where

[tex]m_i = 50 g = 0.050 kg[/tex] is the mass of ice

[tex]\lambda_f=3.33\cdot 10^5 J/kg[/tex] is the latent heat of fusion

So,

[tex]Q_i=(0.050)(3.33\cdot 10^5)=16650 J[/tex]

Then, we call:

[tex]Q_1 = m_i C (T-0^{\circ}C)[/tex] the heat absorbed by the ice (now liquid water) till reaching the equilibrium temperature T, where

[tex]C=4186 J/kgC[/tex] is the specific heat capacity of water

[tex]Q_2=m_s C(100^{\circ}-T)[/tex] the heat released by the steam (now liquid water) till reaching the equilibrium temperature T

Since the total heat absorbed must be equal to the total heat released, we have:

[tex]Q_i+Q_1 = Q_2 + Q_s[/tex]

And now we can solve to find T:

[tex]Q_i + m_i C T = 100 m_s C - m_s C T + Q_s\\T=\frac{Q_s-Q_i-100m_s C}{(m_i+m_s)C}=40.4^{\circ}C[/tex]

The final temperature of the mixture of steam and ice is 40.36 ⁰C.

The given parameters:

  • Temperature of the steam, T = 100⁰C
  • Temperature of the ice, t = 0⁰C
  • Mass of the steam, m = 10 g
  • Mass of ice = 50 g

The final temperature of the mixture of steam and ice is calculated as follows;

[tex]Q_{loss} = Q_{gain}\\\\mc(100 - T) +m L_v = mc(T - 0) + mL_f\\\\0.01\times 4186(100 - T) + 0.01(2.26 \times 10^6)= 0.05( 4186T) + 0.05(3.33\times 10^5)\\\\4186 -41.86T + 22,600 = 209.3T + 16,650\\\\10136= 251.16T\\\\T = \frac{10136}{251.16} \\\\T= 40.36 \ ^0C[/tex]

Thus, the final temperature of the mixture of steam and ice is 40.36 ⁰C.

Learn more about final temperature of mixtures here: https://brainly.com/question/22338034