Question

02.Calcule a massa em gramas de: a) 1 mol de O2 b) 5 mols de H2O c) 6,02X 1024 átomos de H2O​

Answer 1

Olá!:

a )

Massa molar O₂ = 16 × 2 => 32 g/mol ou 32 g de O₂

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b)

Massa molar H₂O = 1 × 2 + 16 => 18 g/mol  , então :

1 mol H₂O ---------------------- 18 g

5 mols H₂O -------------------- x

x = 5 × 18 / 1

x = 90 / 1

x = 90 g de H₂O

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c)

18 g H₂O -------------------- 6,02×10²³ átomos

y g H₂O --------------------- 6,02×10²⁴ átomos

y = ( 6,02×10²⁴ ) × 18  / 6,02×10²³

y = 1,0836×10²⁶ / 6,02×10²³

y = 180 g de H₂O

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Espero ter ajudado!