Hello All,

Request some help/advice?

The danger point in breathing sulfur dioxide for humans is 2620 μg/m3. How many ppm is this value? Final Answer: 0.00183 ppm or 1.83 ppb.

I feel that the answer provided is incorrect. I've tried every approach and angle to solve this question. Can someone on this forum provide some guidance? I can't seem to get the answer provided. Keen to know what I'm doing wrong?

My understanding is that ppm is = moles of substance/ moles of the mixture.

However, when I calculate the moles of SO2 and find the moles of Air in 1m^3 Air (Basis), I find the ratio of the two and get nowhere near that value given in the solutions.

Thanks in advance.