The composition of air by volume is approximately 1/5 oxygen, 4/5 nitrogen. when
air is passed through red-hot carbon, the following reaction occurs: 2c + o2(g)
2co(g). if all of the oxygen is converted to carbon monoxide, what is the
composition, by volume, of the gas produced?
(a)1/5 carbon monoxide, 4/5 nitrogen
(b) 1/3 carbon monoxide, 2/3 nitrogen
(c) 2/5 carbon monoxide, 3/5 nitrogen
(d)1/2 carbon monoxide, 1/2 nitrogen

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.

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