Răspuns:
Explicație:
a) n=5 moli Ca(OH)2
m=?
MCa(OH)2=40+2*16+2*1=40+32+2=74
n=m/M m=n*M=5moli*74 g/mol=370 g
b) n=100moli HNO3
M HNO3=1+14+3*16=1+14+48=63
m=n*M=100moli*63 g/mol=6300 g=6,3 kg
c) n=0,5moli CuCl2
M=64+2*35,5=135
m=n*M=0.5 moli *135 g/mol=67,5 g