Question

Высчитайте молекулярную массу : Пример: Mr (CO2)= Ar (C)+Ar (O)×2 =12+16×2=12 +32 =441. LiCl 2. MgCO3 3. K2SO4 4. H3PO4 5. Na2SiO3 6. Fe(OH)3 7. Ca(OH)2 8. Mg(OH)2 9. Al2O310. Fe2O3 ​

Answer 1

Ответ:

1) Li(7)+Cl(35)=42

2) Mg(24)+C(12)+O(16)×3=36+48=84

3) K(39)×2+S(32)+O(16)×4=78+32+64=174

4) H(1)×3+P(31)+O(16)×4=3+31+64=98

5) Na(23)×2+Si(28)+O(16)×3=46+28+48=122

6) Fe(56)+(O(16)+H(1))×3=56+51=107

7) Ca(40)+(O(16)+H(1))×2=40+34=74

8) Mg(24)+(O(16)+H(1))×2=24+34=58

9) Al(27)×2+O(16)×3=54+48=102

10) Fe(56)×2+O(16)×3=112+48=160

Объяснение:

Вроде правильно

Answer 2

Давайте вычислим молекулярные массы для всех указанных соединений:

1. LiCl:

   • Mr (Li) = 6.941 g/mol
   • Mr (Cl) = 35.453 g/mol Mr (LiCl) = Ar (Li) + Ar (Cl) = 6.941 + 35.453 = 42.394 g/mol

2. MgCO3:

   • Mr (Mg) = 24.305 g/mol
   • Mr (C) = 12.011 g/mol
   • Mr (O) = 15.999 g/mol Mr (MgCO3) = Ar (Mg) + Ar (C) + Ar (O)×3 = 24.305 + 12.011 + 15.999×3 = 84.314 g/mol

3. K2SO4:

   • Mr (K) = 39.098 g/mol
   • Mr (S) = 32.066 g/mol
   • Mr (O) = 15.999 g/mol Mr (K2SO4) = Ar (K)×2 + Ar (S) + Ar (O)×4 = 39.098×2 + 32.066 + 15.999×4 = 174.259 g/mol

4. H3PO4:

   • Mr (H) = 1.008 g/mol
   • Mr (P) = 30.974 g/mol
   • Mr (O) = 15.999 g/mol Mr (H3PO4) = Ar (H)×3 + Ar (P) + Ar (O)×4 = 1.008×3 + 30.974 + 15.999×4 = 97.995 g/mol

5. Na2SiO3:

   • Mr (Na) = 22.990 g/mol
   • Mr (Si) = 28.086 g/mol
   • Mr (O) = 15.999 g/mol Mr (Na2SiO3) = Ar (Na)×2 + Ar (Si) + Ar (O)×3 = 22.990×2 + 28.086 + 15.999×3 = 122.961 g/mol

6. Fe(OH)3:

   • Mr (Fe) = 55.845 g/mol
   • Mr (O) = 15.999 g/mol
   • Mr (H) = 1.008 g/mol Mr (Fe(OH)3) = Ar (Fe) + Ar (O)×3 + Ar (H)×3 = 55.845 + 15.999×3 + 1.008×3 = 106.867 g/mol

7. Ca(OH)2:

   • Mr (Ca) = 40.078 g/mol
   • Mr (O) = 15.999 g/mol
   • Mr (H) = 1.008 g/mol Mr (Ca(OH)2) = Ar (Ca) + Ar (O)×2 + Ar (H)×2 = 40.078 + 15.999×2 + 1.008×2 = 74.094 g/mol

8. Mg(OH)2:

   • Mr (Mg) = 24.305 g/mol
   • Mr (O) = 15.999 g/mol
   • Mr (H) = 1.008 g/mol Mr (Mg(OH)2) = Ar (Mg) + Ar (O)×2 + Ar (H)×2 = 24.305 + 15.999×2 + 1.008×2 = 58.319 g/mol

9. Al2O3:

   • Mr (Al) = 26.982 g/mol
   • Mr (O) = 15.999 g/mol Mr (Al2O3) = Ar (Al)×2 + Ar (O)×3 = 26.982×2 + 15.999×3 = 101.961 g/mol

10. Fe2O3:

    • Mr (Fe) = 55.845 g/mol
    • Mr (O) = 15.999 g/mol Mr (Fe2O3) = Ar (Fe)×2 + Ar (O)×3 = 55.845×2 + 15.999×3 = 159.691 g/mol

Теперь у вас есть молекулярные массы для всех указанных соединений.