12. Si on mélange 20,00 g d'hydroxyde de sodium avec une quantité suffisante de nitrate de fer(III),
Fe(NO3)3(aq), on obtient une solution claire et un
précipité jaune. Quelle est la masse du précipité?

the answer is either b or c

i think that the answer is c

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.