Chemistry: A student eats a muffin for breakfast and then uses the energy from the muffin to walk to school what energy transformations occur in her Body

A student eats a muffin for breakfast and then

rupanti19p4sqpj

12.05.2022

Percentage concentration after evaporated : 26.7%

Further explanation

From 800 grams of 20% concentration solution evaporate 200 grams

the water. What percentage concentration will the new solution obtained have?

From 800 g solution, mass of solute :

$\tt \%concentration\times mass~of~solution\\\\20\%\times 800=160~g$

mass of water :

$\tt 800-160=640$

After water evaporated :

$\tt 640-200=440~g$

mass solution after evaporated :

$\tt 440+160=600~g$

%concentration :

$\tt \dfrac{160}{600}\times 100\%=26.7\%$

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