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Como o sal está todo dissolvido podemos calcular facilmente, a quantidade de mols em 71g de sal de sulfato de sódio:
Na2SO4 – 2(23)+32+4(16)=142g/mol
Logo:
142g _____ 1mol x=71/142=0,5mol
70g ____ X
Volume:
1L ____ 1000ml x=250/1000=0,25L
X _____250ml
Calculando a consentração temos:
C=M/V
C=0,5/0,25=2 mol/L
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