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felia
@felia
April 2023
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Bonjour, bonsoir je ne comprends pas cet exercice de physique chimie. Pouvez-vous m’aider s’il vous plaît ?
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brnly
Explications :
■ Masse molaire du plomb :
M = 3,442x10^(-22) gram x 6,02x10^(23) atomes/mole
≈ 207,2 grammes/mole .
■ 207,2 gram <--> 1 mole = 6,02x10^(23) atomes
2,5 gram <--> ? mole = ? atomes
réponse :
2,5/207,2 ≈ 0,012066 mole
puis 0,012066 x 6,02x10^(23) ≈ 7,264x10^(21) atomes
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■ Masse molaire du plomb :
M = 3,442x10^(-22) gram x 6,02x10^(23) atomes/mole
≈ 207,2 grammes/mole .
■ 207,2 gram <--> 1 mole = 6,02x10^(23) atomes
2,5 gram <--> ? mole = ? atomes
réponse :
2,5/207,2 ≈ 0,012066 mole
puis 0,012066 x 6,02x10^(23) ≈ 7,264x10^(21) atomes