An aluminium sphere with a mass of 4.2 kg and an initial temperature of 250°C is placed in a closed, thermally Isolated container with 30 kg water water - 4 185kg 1.c '). Determine the final/equilibrium temperature if the initial temperature of the water is 14 C.
A. 20.9°C
B. 132.0°C
C. 6.7°C
D. 26.3°C

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Nacidified solution was electrolyzed using copper electrodes. a constant current of 1.18 a caused the anode to lose 0.584 g after 1.52 ✕ 103 s. given that the charge of an electron is 1.6022 ✕ 10−19 c, calculate avogadro's number. assume that copper is oxidized to cu2+ ions.

Why is rain likely when warm, moisture-laden air meets cold air? a) the lighter warm air will rise and cool down, causing condensation and rain. b) the cold air moves faster and pushes the warm air away, causing condensation and rain. c) the moisture in the warm air condenses on contact with the cold air, causing rain to fall. d) the cold air mixes with the warm air, reducing its temperature causing moisture to condense.