The ratio of the number of molecules of 4g of hydrogen to that of 32g of oxygen is ?

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

elements make up everything, and they combine to make compounds.

the answer is c

b) nuclear ive learned that in a pedtrodic table