Answer :

Answer: 0.3cm^3

Explanation:

Given that 30 cm^3 of carbon monoxide (CO) is sparked with 30 cm^3 of oxygen at STP (Standard Temperature and Pressure), the reaction consumes all of the gases in a 1:1 volume ratio. This means that all of the 30 cm^3 of CO and 30 cm^3 of oxygen will react completely, leaving no unused gas.

Therefore, in this scenario, the volume of unused gas is 0 cm^3.

Answer:

Explanation:

FIRST:  That should be  cm^3   not cm of CO and O2

Second :   find the balanced equation

   2  CO +   O2  ====>   2 CO2

THIRD     this shows that 1/2 of the O2 will be left

                   15 cm^3   of O2 will be left unused