Question

Alegeţi şirul ce corespunde maselor moleculare corecte ale următoarelor substanţei rezolvaţi pe caiete): Ca(OH)2, H2SO4, Ca3(PO4)3, H3PO4, CaCO3
A57g/mol; 98g/mol; 310g/mol; 98g/mol; 100g/mol
B) 74g/mol; 98g/mol; 310g/mol; 98g/mol;100g/mol
с
74g/mol; 96g/mol; 310g/mol; 98g/mol; 100g/mol

Answer 1

Răspuns:

Ca(OH)2, H2SO4, Ca3(PO4)2, H3PO4, CaCO3

MCa(OH)2=40+2×16+2×1=74g/mol

MH2SO4 =2×1+32+4×16=98g/mol

MCa3(PO4 )2=3×40+2×31+8×16=310g/mol

MH3PO4 =3×1+31+4×16=98g/mol

MCaCO3=40+12+3×16=100g/mol

B) 74g/mol; 98g/mol; 310g/mol; 98g/mol;100g/mol