Question

1,2 carbon pur reactioneaza la cald cu oxid de cupru.Sa se afle:
a)cantitatea de oxid de cupru de puritate 80% intrata in reactie
b)cantitatea de dioxid de carbon obtinuta din reactie
c)cantitatea de cupru obtinuta
Va rog ajutati ma.Dau 14 puncte si coroana.Multumesc!

Answer 1

MC=12g/mol

MCuO=ACu+AO=64+16=80g/mol

MCO2 = AC+2AO=12+2*16=44g/mol

MCu=64g/mol

a) C + 2CuO = CO2 + 2Cu

12g C...............2*80g CuO
1,2g C.................x=16g CuO (m pur)

puritatea = mpur/ mimpur*100 => mimpur=mpur*100/puritate = 16*100/80 = 20g CuO

b) 12g C......................44g CO2
1,2g C..........................4,4g CO2

c) 12g C......................2*64g Cu
1,2g C............................x=12,8g Cu