Question

A solution is prepared by adding 2 g of a substance A to 18 g of water. calculate the mass per cent of the solute.​

Answer 1

Given :-

• Mass of solute, A = 2 g.

• Mass of solvent (water) = 18 g

To Find :-

• Mass % of solute, A

Solution :-

At first, we need to find mass of solution.

Mass of solution

= Mass of solute + Mass of solvent

= 2 g + 18 g

= 20 g

$\underline{\:\textsf{ We know that :}}$

$\rm{Mass\:\%\:of\:A=\dfrac{Mass\:of\:A}{Mass\:of\:solution}\times{}100}$

$\underline{\:\textsf{ Putting the values :}}$

$\dashrightarrow \rm{\dfrac{2\:g}{20\:g}\times{}100}$

$\dashrightarrow \rm{\dfrac{100}{10}\%}$

$\dashrightarrow \rm{Mass\:\%\:of\:A=}\:\bold{10\%.}$

$\;\;\underline{\textbf{\textsf{ Hence-}}}$

$\underline{\textsf{Required answer is </p><p>\textbf{10\:Percentage }}}.$

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Answer 2

Answer:

A solution is prepared by adding 2 g of a substance A to 18 g of water. calculate the mass per cent of the solute.