What is the definition of specific heat ? apex

specific heat is the heat required to raise the temperature of the unit mass of a given substance by a given amount

Specific Heat is the amount of heat required to raise the raise the temperature of a substance to one kelvin.

It is an extensive property that has units of measure of joule per kelvin. J/K

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