Question

Cat cantaresc 10 atomic de calciu?
DAR 4 moli de H2So4??

Answer 1

masa unui mol Ca contine numarul lui Avogaro de atomi, adica

40g......................6,023x10²³ at Ca

x.....................................10 at

x= 56,4x10⁻23 g

1mol H2SO4   are masa  (2x1gH+32gS + 4x16gO)

4mol.....................................................x.......................................calculeaza !!!!!