In lab you will be preparing five aqeous solutions of glycerine (C3H8O3), each a different predetermined %(m/m) and each to a total mass of 30 g. How many grams of deionized water should you measure to make your 20 %(m/m) solution for lab?

Question

There are 6.00 grams of glycerin that should be measured to make your 20% (m/m).

1582 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2018-02-21T20:24:49

24 g

$sf(M_g/(M_g+M_w)=0.2)$

$sf(M_g+M_w=30color(white)(x)g)$

$:.$ $sf(M_g/30=0.2)$

$:.$ $sf(M_g=0.2xx30=6color(white)(x)g)$

$:.$ $sf(M_w=30-6=24color(white)(x)g)$