Calcola il volume in mL di una soluzione di acido solforico (d=1,83 g/mL) al 20% m/m che
occorre per preparare 60 mL di soluzione al
25% m V di tale acido.

kuchisake

kuchisake-onna (口裂け女, "slit mouth woman ") is a malevolent figure appearing in japanese ghost stories, possibly dating back to the edo period. she takes the form of a masked woman who approaches people and asks them if they believe she is pretty.

explanation:

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).

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