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How many molecules are present in 3 mols of silicon dioxide (sio2)?

A175 g lump of molten lead at its melting point (327 c) is placed into 55.0 g of water at 20.0 c. the specific heat of lead is 130.j/kg c and the hf of lead is 20,400 j/kg. when the lead and the water have reached equilibrium, what is the temperature of the mixture?

True or false: the revolution of the earth creates day and night as it rotates around the sun