Răspuns:
Explicație:
a. MCaBr2= 40 + 2.80=200------> 200g/moli
m= n .M
m= 3,5 moli . 200g/moli=700 g CaBr2
b. MCaO=40 +16=56------->56g/moli
2kmoli=2000 moli CaO
m= 2000 moli. 56=112000g CaO=112kg
c. MNaNO3= 23 +14 +3.16=95------> 95g/moli
15m moli=0,015moli
m= 0,015 moli .95g/moli=1,425g NaNO3