Question

Dadas as massas atômicas: Na=23; Ca=40; Cl=35,5; K=39; Br=80; N=14; O=16; Ba=137; S= 32; Mg=24; Al=27; P=31. Calcular as massas moleculares das substâncias : a) NaCl b) KBr c) Ca(NO3)2 d) BaSO4 e) KCl f) MgBr2 g) CaCl2 h) AlPO4

Answer 1

Resposta:Segue as contas abaixo na explicação

Explicação:

a) NaCl--->23x1+35,5x1--->23+35,5-->58,5 g/mol

b) KBr--->39x1+80x1--->39+80-->119 g/mol  

c) Ca(NO3)2--->40x1+14x2+16x6--->40+28+96-->164 g/mol  

d) BaSO4--->137x1+32x1+16x4--->137+32+64-->233 g/mol

e) KCl--->39x1+35,5x1--->39+35,5-->74,5 g/mol

f) MgBr2--->24x1+80x2--->24+160-->184 g/mol

g) CaCl2--->40x1+35,5x1--->40+71-->111 g/mol  

h) AlPO4--->27x1+31x1+16x4--->27+31+64-->122 g/mol