Question #21049

Calculate the molarity of a solution prepared by dissolving 78.6g of KF in enough water to produce 225ml of solution. (at mass of F= 19g/mol, K= 39.10g/mol

Expert's answer

molarity = amount / liter

amount n = m/M_{w}

m-mass

M_{w} - molecular mass

in the question m = 78.6 g

M_{w} = 58.1 g/mol

n = 78.6/58.1 = 1.35 mol, but it is in 225 ml, and in 1000 ml or 1 L it would be X

X = 1.35*1000/225 = 6 M

amount n = m/M

m-mass

M

in the question m = 78.6 g

M

n = 78.6/58.1 = 1.35 mol, but it is in 225 ml, and in 1000 ml or 1 L it would be X

X = 1.35*1000/225 = 6 M

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