Explain the law of conservation of energy.

Energy cannot be destroyed or created but can be transformed from one form to another

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

you gotta add the following molecules so we can give u an answer

explanation: