Question

Sa se determine numarul de molecule din 200 grame de substanta , la alegere 2 exemple din ce le 4 categorii invatate (oxizi, acizi, baze si saruri)...Suntin cls a 7 a...Va rog ajutati.ma ..Mersi anticipat

Answer 1

Prima substanta CaCO₃
Masa moara=40+12+48=100g/mol

1mol........................100g
x moli......................200g
x=2moli

1mol...............................6.023*10²³ molecule
2moli...............................y
y=12.046*10²³ molecule

A doua substanta: Cu(OH)₂
Masa molara Cu(OH)₂=64+32+2=98g/mol

1mol..........................98g
z moli........................200
z=2.04moli

1mol.................................6.023*10²³ molecule
2.04moli.............................w
w=12.28692*10²³ molecule