1) Find the energy change of the system required to change 200 g of water at 273 K. 2)Find the energy change of the system required to change 1200 g of steam at 373
3)What is the heat change for a 348 g sample of steam at 373 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

the answer to this question is 3.

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).