Amigos yo estudie en un campo y alla no habia prof de quimica asi que esa materia para mi es nueva yo entiendo algunos ejercicios de los que la profe me da aqui en mi nuevo liceo pero hay unos ejersic?

1. Calcular masa molecular K = 39 g / mol

Mm H2O = 18 g / mol

2.

Calcular mol aplicando la fórmula mol = mas / Mm

mol = 250 g `````````` 39 g / mol

mol = 6.

4102

2.

Convertir mL a L

L = 56 mL / 1000 = 0.

056 L

3.

Aplicar la fórmula de molaridad

M = mol soluto `````````````` V(solc.

)

M = 6.

4102 mol ````````````````` 0.

056 L

M = 114.

46 molar

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%m / v = masa soluto x 100 `````````````````` v solc.

Preparar la solución

v solución : m soluto + v solvente

v solución : 250 g + 56 mL = 306 mL

%m / v = 250 g x 100 `````````` 306 mL

%m / v = 81.

69 %

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la resolvi de dos formas

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balancear la siguiente ecuacion, sabiendo que sus pesos atomicos son al : 26, 98grs, cl : 35, 45grs 2AlCl3 → 2 Al + 3Cl2 2( 133.

34 g ) → 2( 26.

98 g) + 6(35.

45 g) 266.

66 g = 53.

96 g + 212.

7 g 266.

66 g = 266.

66 g

Se cumple la ley de la conservación de la masa.