La molalidad se refiere al número de mol de soluto que se encuentra disuelto en un kilogramo de solvente. Por lo tanto, su unidad es mol/kg y se designa con la letra “m” minúscula. Por ejemplo: Si una solución presenta una concentración 5 molal, significa que contiene 5 mol de soluto en cada kilogramo de solvente. La expresión matemática empleada para calcular la molalidad es:
Datos:
m = ?
masa soluto = 12 g
masa solvente = 350 g
Masa molar Al(OH)3= 78 g/mol
2. Calcula la molalidad de una disolución de HBr al 27% m/m de densidad 1,45g/ml. Masa molar del HBr = 81 g/mol.
Datos.
m = ?
%m/m = 27%
ρ= 1,45 g/ml
MM HBr = 81 g/mol
Nota: *Como no nos indican el volumen de la solución, asumimos que es 1 L= 1000 ml*
masa solución = 1,45 g/ml x 1000 ml
masa solución = 1450g
1450 g solución ————- 100%
X soluto ———————– 27 %
X = 391,5 g soluto
Masa solución = masa soluto + masa solvente
Masa solvente = masa solución – masa soluto
Masa solvente = 1450g – 391,5g
Masa solvente = 1058,5g
1 Kg ————– 1000 g
X ————- 1058,5g
X = 1,06 Kg solvente
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Italian soccer team Udinese to play match behind closed doors after alleged racist abuse from fans
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Italian soccer team Udinese has been ordered to play one game behind closed doors following the alleged racist abuse aimed at AC Milan goalkeeper Mike Maignan during its game on Saturday, Italian league Serie A announced Tuesday.
Udinese, a team in the Italian top division, was playing at home when the incident occurred.
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Following the alleged racist chants directed at the goalkeeper by Udinese fans, Maignan led his team off the pitch at Bluenergy Stadium in Udine.
CNN has also reached out to the Italian football federation (FIGC) for comment.
Udinese announced Monday that it has identified and issued a lifetime ban to the “first individual responsible for discriminatory behavior” towards Maignan.
“This ban is effective immediately,” the club said in its statement.
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