\textbf{164-} We mix 800 grams of ice at zero degrees Celsius with 800 grams of water at $20^\circ\text{C}$. If only the heat exchange between ice and water occurs, after thermal equilibrium is established, how many grams of water will we have and at what temperature in degrees Celsius?
$$\left(C_{\text{water}} = 4.2 \, \frac{\text{J}}{\text{g.K}} \quad \text{and} \quad L_f = 336 \, \frac{\text{J}}{\text{g}}\right)$$
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(1) 1000 and zero \hspace{0.5cm} (2) 1200 and zero \hspace{0.5cm} (3) 1600 and 2 \hspace{0.5cm} (4) 1600 and 4
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