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Leya [2.2K]
3 years ago
10

Which number is 0.0069 expressed in scientific notation?

Chemistry
2 answers:
natali 33 [55]3 years ago
7 0
6.9 x 10 to the power of 3 if I am not mistaken.
lapo4ka [179]3 years ago
4 0

6.9 x 10-3...... is the answer for srue

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A 1. 00 ml sample of an unknown gas effuses in 11. 1 min. an equal volume of h2 in the same apparatus under the same conditions
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A 1. 00 ml sample of an unknown gas effuses in 11. 1 min. an equal volume of h2 in the same apparatus under the same conditions effuses in 2. 42 minutes then the molar mass of the unknown gas is 41.9.

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Molar mass of unknown gas = ?

rate 1 = 11.1

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<h3>What is graham law? </h3>

Graham's law states that the rate of diffusion or effusion of a given gas is inversely proportional to the square root of its molar mass.

By apply graham law

Rate1/rate2 = sqrt(MW2/MW1)

[\frac{rate1}{rate2} ]^{2} = \frac{MW2}{2} \\\\\\mw= 2[\frac{11.1}{2.42} ]^{2} \\\\= 20.97 X 2 \\\\= 41.9

Thus, we found that the molar mass of the unknown gas is 41.9.

Learn more about graham's law: brainly.com/question/12415336

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