A40.-g sample of impure kclo3 (solubility = 7.1 g per 100 g h2o at 20° c) is contaminated with 19 percent of kcl (solubility = 25.5 g per 100 g of h2o at 20° c). calculate the minimum quantity of 20° c water needed to dissolve all the kcl from the sample. (assume that the solubilities are unaffected by the presence of the other compound.)

29.80 grams is the minimum quantity of 20° C water needed to dissolve all the KCl from the sample.

Explanation:

Mass of impure sample of = 40 g

Percentage of KCl impurity sample = 19%

Mass of KCl impurity sample = 19% of 40 g =

Solubility of KCl in 100 grams of water at 20° C = 25.5 g.

Mass of water required dissolve of 1 gram KCl =

The mass of water required dissolve 7.6 g of KCl at 20°C=

29.80 grams is the minimum quantity of 20° C water needed to dissolve all the KCl from the sample.

2b2t

explanation:

2b2t

hey there!

mass = 6.75 g

volume =   9 cm³

therefore:

d = mass / volume

d   = 6.75 / 9

d = 0.7 g/cm³

answer b