Question

Cual es la concentracion % de una rebanada de pan de 28g con 3.4 ppm de sodio

Answer 1

0.00034% is the (w/w) concentration of sodium in 28 grams of bread.

Step-by-step explanation:

Mass of bread = 28 g =0.028 kg (1 g = 0.001 kg)

The ppm concentration of sodium = 3.4

1 ppm = 1 mg/kg

The ppm concentration of sodium = 3.4 mg/kg

This means 3.4 mg of sodium is present in 1 kg of bread.

The mass of sodium present in 0.028 kilograms of bread will be:

`3.4 mg/kg* 0.028 kg=0.0952 mg`

Mass of sodium present in bread = 0.0952 mg

Mass of bread in milligrams = 28 g = 28000 mg

w/w % : The percentage mass is the mass of the of solute present in total mass of the solution.

`w/w\%=\frac{\text{Mass of solute}}{\text{Mass of solution}}* 100`

`w/w\%=(0.0952 mg )/(28000 mg)* 100=0.00034\%`

0.00034% is the (w/w) concentration of sodium in 28 grams of bread.