It takes 50.0 J to raise the temperature of an 8.20 g piece of unknown metal from 13.0∘C to 24.2 ∘C. What is the specific heat for the metal

Explanation:

Given that,

Heat required, Q = 50 J

Mass of unknown metal, m = 8.2 g

The temperature rises from 13.0°C to 24.2 °C.

We need to find the specific heat for the metal. We know that the heat required to raise the temperature is given by :

c is specific heat of the metal

So, the specific heat of the metal is

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

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~ trueboss72