# 查看完整版本 : Percentage by volume...急用

I-loveyou 2012-6-6 10:09 PM

## Percentage by volume...急用

In Haber process,
the composition of the gaseous mixture after passing over the catalyst was investigated by bubbling 2000cm^3 of the gas at room temperature and pressure through 100cm^3 of 0.3M HCl. The final concentration of HCl was found to be 0.2M. Calculate the precentage of NH3 by volume in the mixture.

jmlo 2012-6-8 05:57 AM

## 回覆 1# 的帖子

Not to provide you with the full solution but some hints which should be sufficient for you to figure out the answer.

(1) The change of concentration of HCl before and after bubbling the gas mixture:
# moles HCl consumed = (0.3M - 0.2M)*0.1L

(2) The amount of NH3 in the gas mixture (in ideal scenario):
# moles HCl consumed = # moles NH3 present in the mixture

(3) Volume of NH3 at room temperature and pressure:
(# moles NH3)*(volume of 1 mole ideal gas at room temperature and pressure)

(4) % NH3 by volume
(Volume of NH3)/(Volume of gas mixture) * 100%