A 21 gram piece of metal at 145 C is dropped into 81 grams of water at 18 C. The water temperature rose to 41 C. Calculate the heat change of the metal in joules. The specific heat of the water js 4.184 J / g C

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Explanation:

b is the correct answer

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atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8