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Cplyc
@Cplyc
May 2019
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La suspension S a été obtenue en mélangeant 10g de yaourt dans 90mL de diluant.
Sachant que 1g de yaourt contient 1.0x10puissance7 bactéries, calculer la concentration en bactéries de la solution S
Pouvez vous m'aider svp
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scoladan
Verified answer
Bonjour,
1 g de yaourt contient 1,0.10⁷ bactéries
Donc 10 g contiennent 10 x 1,0.10⁷ = 1,0.10⁸ bactéries.
Soit une concentration dans le volume V = 90 mL = 90.10⁻³ L = 9,0.10⁻² L de :
C = 1,0.10⁸/9,0.10⁻² = 1,1.10⁹ bactéries/L
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Verified answer
Bonjour,1 g de yaourt contient 1,0.10⁷ bactéries
Donc 10 g contiennent 10 x 1,0.10⁷ = 1,0.10⁸ bactéries.
Soit une concentration dans le volume V = 90 mL = 90.10⁻³ L = 9,0.10⁻² L de :
C = 1,0.10⁸/9,0.10⁻² = 1,1.10⁹ bactéries/L