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## Homework Statement

A 185 m3 room must be filled with 4 ppm NO2 gas (Nitrogen dioxide). The gas comes in cylinder of 200 bar and 50 liters (20x50 = 10,000 liters) and 50 ppm. How many cylinders are needed?

## Homework Equations

1 ppm = 1/1,000,000 (parts per million)

(can't think of more relevant equations)

## The Attempt at a Solution

To be honest I do not know how to begin. The ppm part is completely new to me.

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