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A glass of mass 65.0 g contains 330 g of water. The glass and water are in thermal equilibrium at 25.0 ℃.Calculate the minimum mass of ice at 0.00 ℃ to be added to the glass that will reduce its temperature to 0.00 ℃.Give your answer to an appropriate number of significant figures and with units.Assume that no heat is lost to the surroundings.                specific latent heat of fusion of ice = 3.33 × 105 J kg−1                specific heat capacity of water = 4 200 J kg−1 K−1                specific heat capacity of glass = 510 J kg−1 K−1

Question

A glass of mass 65.0 g contains 330 g of water. The glass and water are in thermal equilibrium at 25.0 ℃.Calculate the minimum mass of ice at 0.00 ℃ to be added to the glass that will reduce its temperature to 0.00 ℃.Give your answer to an appropriate number of significant figures and with units.Assume that no heat is lost to the surroundings.                specific latent heat of fusion of ice = 3.33 × 105 J kg−1                specific heat capacity of water = 4 200 J kg−1 K−1                specific heat capacity of glass = 510 J kg−1 K−1

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Solution

To solve this problem, we need to calculate the amount of heat that must be removed from the glass and water to bring their temperature down to 0.00 ℃, and then determine the mass of ice required to absorb that amount of heat.

  1. Calculate the heat lost by the water:

    • Mass of water, mw=330g=0.330kg m_w = 330 \, \text{g} = 0.330 \, \text{kg}
    • Initial temperature of water, Ti=25.0 T_i = 25.0 \, \text{℃}
    • Final temperature of water, Tf=0.00 T_f = 0.00 \, \text{℃}
    • Specific heat capacity of water, cw=4200Jkg1K1 c_w = 4200 \, \text{J} \, \text{kg}^{-1} \, \text{K}^{-1}

    The heat lost by the water, Qw Q_w , is given by: Qw=mwcw(TiTf) Q_w = m_w \cdot c_w \cdot (T_i - T_f) Qw=0.330kg4200Jkg1K1(25.0K0.00K) Q_w = 0.330 \, \text{kg} \cdot 4200 \, \text{J} \, \text{kg}^{-1} \, \text{K}^{-1} \cdot (25.0 \, \text{K} - 0.00 \, \text{K}) Qw=0.330420025.0 Q_w = 0.330 \cdot 4200 \cdot 25.0 Qw=34650J Q_w = 34650 \, \text{J}

  2. Calculate the heat lost by the glass:

    • Mass of glass, mg=65.0g=0.0650kg m_g = 65.0 \, \text{g} = 0.0650 \, \text{kg}
    • Specific heat capacity of glass, cg=510Jkg1K1 c_g = 510 \, \text{J} \, \text{kg}^{-1} \, \text{K}^{-1}

    The heat lost by the glass, Qg Q_g , is given by: Qg=mgcg(TiTf) Q_g = m_g \cdot c_g \cdot (T_i - T_f) Qg=0.0650kg510Jkg1K1(25.0K0.00K) Q_g = 0.0650 \, \text{kg} \cdot 510 \, \text{J} \, \text{kg}^{-1} \, \text{K}^{-1} \cdot (25.0 \, \text{K} - 0.00 \, \text{K}) Qg=0.065051025.0 Q_g = 0.0650 \cdot 510 \cdot 25.0 Qg=828.75J Q_g = 828.75 \, \text{J}

  3. Calculate the total heat to be removed: Qtotal=Qw+Qg Q_{\text{total}} = Q_w + Q_g Qtotal=34650J+828.75J Q_{\text{total}} = 34650 \, \text{J} + 828.75 \, \text{J} Qtotal=35478.75J Q_{\text{total}} = 35478.75 \, \text{J}

  4. Calculate the mass of ice required to absorb this heat:

    • Specific latent heat of fusion of ice, Lf=3.33×105Jkg1 L_f = 3.33 \times 10^5 \, \text{J} \, \text{kg}^{-1}

    The mass of ice, mi m_i , is given by: Qtotal=miLf Q_{\text{total}} = m_i \cdot L_f mi=QtotalLf m_i = \frac{Q_{\text{total}}}{L_f} mi=35478.75J3.33×105Jkg1 m_i = \frac{35478.75 \, \text{J}}{3.33 \times 10^5 \, \text{J} \, \text{kg}^{-1}} mi=0.106kg m_i = 0.106 \, \text{kg}

Therefore, the minimum mass of ice required to reduce the temperature of the glass and water to 0.00 ℃ is 0.106kg 0.106 \, \text{kg} or 106g 106 \, \text{g} .

This problem has been solved

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