Question

determinti numarul de molecul din 200g de substanta la alegerre (2 exemple) din atomi molecul saruri si acizi

Answer 1

1. H20
M H2O=2+12=14
nr moli=200/14=14.28
nr molecule =nr moli* nr lui Avog.(NA)= 14.28NA
2. H2SO4
M  H2SO4=2+64+32=98
nr moli=200/98=2.04
nr molec=2.04*NA
SPER CA TE-AM AJUTAT!

Answer 2

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