Question

11) Qual alternativa corresponde respectivamente as massas moleculares das
seguintes substâncias: CO, NaOH, NaCl, Al2(SO4)3
a) 28 ; 60; 48,5; 342
d) 28; 40; 48,5; 340
b) 28; 40; 48,5 ; 342
c) 14 ; 20; 62,5; 340

Answer 1

$\text{CO} \equiv 12\text{u}+16\text{u} \equiv 28\text{u}$

$\text{NaOH} \equiv 23\text{u}+16\text{u}+1\text{u} \equiv 40\text{u}$

$\text{NaCl} \equiv 23\text{u}+35,5\text{u}\equiv 58,5\text{u}$

$\text{Al}_2\text{(SO}_4\text{)}_3 \equiv 2\cdot27\text{u}+3\cdot(32\text{u}+4\cdot16\text{u}) \equiv 342\text{u}$

Resposta: b) 28; 40; 48,5 ; 342