Burning 1.43 g of methane [CH4(g), molar mass 16.0 g/mol] with excess O2 raised the temperature of 250 g of water in a bomb calorimeter from 22°C to 98°C. Calculate the molar enthalpy of the combustion of methane.

The gas would begin to expand, and eventually the can would burst or explode.

the catch is that the top numbers are atomic masses the bottom numbers are the numbers of protons and electrons in an uncharged atom. they are the number of that atoms as you would find them on the periodic table. further, the numbers on the left are used to determine the missing numbers on the right

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

Show and image of the mixtures or write them