22-05-2017
Chemistry

contestada

Calculate the concentration in % (m/m) of a solution containing 30.0g of mgcl2 dissolved in 270.0g of h20

A 11.75%
B 10.0 %
C 8.34 %
D 7.41 %
E 15.0 %

Respuesta :

JavierCollante JavierCollante

22-05-2017

as the question tells you, you need to use the formula

% mass= mass of solute/ mass of solution x 100

mass solute= 30.0 g
mass of solution= 30.0 + 270.0= 300.0 g

% mass= 30.0/ 300.0 x 100= 10%

answer is B

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