# chemistry

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#1
1) The recommended limit for safe exposure to sulfur dioxide in the air is 0.000025%. What is the concentration in parts per million,ppm?a)25b)0.25c)0.025d)0 .0025
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4 weeks ago
#2
I have seen that question before in past paper exam.

Concentration = (0.000025 * 10^6) / 100 = 0.25
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#3
(Original post by UNKNOWN 25)
I have seen that question before in past paper exam.

Concentration = (0.000025 * 10^6) / 100 = 0.25
thank youuu so much but why did you divide by 100
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4 weeks ago
#4
(Original post by staerryynighht)
thank youuu so much but why did you divide by 100
Concentration is equal to mass of solute* 1 000 000/ mass of solvent.
The mass of solute is 0.000025 in 100 part of the solvent.
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