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Sphinxa [80]
3 years ago
11

A solution contains 39% phosphoric acid by mass. This means that ________. 100 g of this solution contains 39 g of phosphoric ac

id 1 mL of this solution contains 39 g of phosphoric acid 1 L of this solution has a mass of 39 g 1 L of this solution contains 39 mL of phosphoric acid the density of this solution is 3.9 g/mL
Chemistry
1 answer:
Arlecino [84]3 years ago
6 0

Answer:

A. 100 g of this solution contains 39 g of phosphoric acid

Explanation:

The formular for percentage by a mass id usually given as;

( Mass of element / Mass of compound ) * 100%

So when a solution contains 39%  by mass of phosphoric acid, it means that in 100 units of the solution, there are 39 units of phosphoric acid.

The only option that satisfies this is option A. 100 g of this solution contains 39 g of phosphoric acid

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A red sports drink contains Red 40 dye. A 5.4 mL aliquot of this sports drink was diluted to 25.0 mL with deionized water in a v
miskamm [114]

Answer:

84.0 ppm is the concentration of Red 40 dy in the original sports drink.

Explanation:

Concentration of red dye in sport drink before dilution C_1=?

Volume of the sport drink before dilution V_1=5.4 mL

Concentration of red dye in sport drink after dilution C_2=18.1 ppm

Volume of the sport drink after dilution V_2=25.0 mL

C_1V_1=C_2V_2( dilution )

C_1=\frac{C_2V_2}{V_1}=\frac{18.1 ppm\times 25.0 mL}{5.4 mL}

C_1=83.80 ppm\approx 84.0ppm

84.0 ppm is the concentration of Red 40 dy in the original sports drink.

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