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Answer the following questions: a) A sample of lead with a mass of 1.45 kg is...

Answer the following questions:

a) A sample of lead with a mass of 1.45 kg is heated until it reaches its melting point at 330 C. The lead is then heated further until it has entirely melted. During this process, the lead absorbs a total of 4.46 * 10 ^ 4 J as heat. What is the temperature at which the lead is initially heated?

b) Gallium melts at 29.78 C, a temperature that can be achieved by the atmosphere at Earth's surface. In fact, gallium can melt in your hand. Suppose a person holds 0.35 kg of gallium at its melting point. How much energy must be transferred as heat to the gallium in order for it to completely melt?

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