Question

Vă rog frumos sa ma ajutati la următorul ex... Dau coroana.... Rapid va rog. Ex 3... Pls

Answer 1

1mol atomi Na----------6,023 .10²³ atomi Na

xmoli-------------------12,046 .10²³ atomi Na

x=12,046 .10²³ : 6,023 .10²³= 2moli Na

n=m:M

m=n.M

m=2moli ..23g/moli=46 g Na

1mol Li----------6,023.10²³atomi Li

x-------------------18,069.10²³

x=18,069 .10²³ : 6,023.10²³=3 moli Li

m=n.M

m=3moli . 7g/moli=21 g Li

1mol Al----------6,023.10²³atomi Al

x-----------------30,115 .10²³

x=30,115 .10²³: 6,023.10²³=5moli Al

m=n.M

m=5moli.27g/moli=135 gAl