Question

Calcular la molaridad de una disolución de 2,12 g de kbr en 458 ml de disolución. .

Answer 1

Mm KBr = 119 g/mol

1. calcular moles

n = 2.12 g  x  1 mol
                    ``````````
                     119 g

n = 0.0178 moles

2. convertir mL a L

L = 458 / 1000 = 0.458 L

3. Calcular M = moles soluto / V(L)

M = 0.0178 moles / 0.458 L

M = 0.038 molar