Respuesta :

Answer:

10% of 810g is 81g

therfore she needs to add 81g of salt to make 891g of solution

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Step-by-step explanation:


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Answer:

90 g; 900 g  

Step-by-step explanation:

Mass % = Mass of salt/(mass of salt + mass of water) × 100 %

Mass % = m₂/(m₁ + m₂) × 100 %

Data:

Mass % = 10 %

        m₁ = 810 g

Calculations:

               10 % = m₂/(810 + m₂) × 100 %

                0.10 = m₂/(810 + m₂)      Divide by 100 %

0.10(810 + m₂) = m₂                        Multiply each side by (810 + m₂)

   81 +0.10 m₂ = m₂                        Subtract 0.10m₂ from each side

                  81 = 0.90m₂                 Divide each side by 0.90

                 m₂ = 90 g

Mass of solution = m₁ + m₂ = 810 g + 90 g = 900 g

Check:

10 % = 90/900 × 100 %

10 % = 1/10 × 100 %

10 % = 10 %


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