Chemistry, 18.03.2021 17:00 Oliviapuffinburger33

1- Qual massa de ácido sulfúrico (H 2 SO 4 ) será necessária para preparar 2 litros de uma solução na concentração de 3 mol/L?
Dado: M(H 2 SO 4 )= 98 g/mol. M= 2.1+32+4.16= 98g
Dados do exercício:
m 1 = ? (é o que se quer encontrar)
M 1 = 98 g/mol
V (L) = 2 L
C = 3 mol/L

2- (Fuvest-SP) A concentração de íons fluoreto em uma água de uso
doméstico é de 5,0 · 10 –5 mol/litro. Se uma pessoa tomar 3,0 litros
dessa água por dia, ao fim de um dia, a massa de fluoreto, em
miligramas, que essa pessoa ingeriu é igual a: (massa molar do
fluoreto: 19,0 g/mol)

Dados do exercício:
m 1 = ? (é o que se quer encontrar)
M= 19,0 g/mol
V (L) = 3 L
C= 5 . 10 -5 mol/L
Aplicando os dados na fórmula da concentração em mol/L,
temos:

Answers: 1

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