Does the concentration of coumarin-102 increase or decrease over time with base? What do you expect to happen with the light being emitted by coumarin-102?

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

Maybe you should get some from your teacher and learn more so you can get your grades up and maybe study a bit more

The mole ratio of hydrogen to ammonia is 3: 2.