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ChessusOwns
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December 2019
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Qual a quantidade de átomos de oxigênio em 162g de água (H2O)?
( ) 3,60E+24
( ) 3,00E+24
( ) 5,40E+24
( ) 4,80E+24
( ) Impossivel de se resolver
( ) 4,20E+24
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MP39
Olá!!!
MM(H2O) = 2•1+16 = 18g/mol
MM(O) = 16g/mol
____________________________
RESOLUÇÃO
18g de H2O ----- 16g de Oxigénio
162g de H2O ----- X
X = 2592 / 18
X = 144g de Oxigénio
1 mol ---- 16 ----- 6•10²³
------------ 144g ----- X
X = 144 • 6•10²³ / 16
X = 8,64•10^25 / 16
X = 5,4•10²⁴ átomos
2 votes
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MM(H2O) = 2•1+16 = 18g/mol
MM(O) = 16g/mol
____________________________
RESOLUÇÃO
18g de H2O ----- 16g de Oxigénio
162g de H2O ----- X
X = 2592 / 18
X = 144g de Oxigénio
1 mol ---- 16 ----- 6•10²³
------------ 144g ----- X
X = 144 • 6•10²³ / 16
X = 8,64•10^25 / 16
X = 5,4•10²⁴ átomos