Question

Calcule la masa molecular: utilice los pesos atómicos de la tabla periódica con una sola cifra decimal (no aproxime a números enteros)
-KI -CuSO4
-H2SO4 -HCI
-HNO3 -Na2S
-CH4

Answer 1

1.  KI

K: 1 x 39 = 39 g/mol
  I: 1 x 126.9 =126.9 g/mol
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              Mm = 165.9 g/mol

2.  CuSO4

Cu: 1 x 63.5 = 63.5 g/mol
  S: 1 x 32   =  32 g/mol
  O: 4 x 15.9 = 63.6 g/mol
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            Mm = 159.1 g/mol

3.  H2SO4

H: 2 x 1.00 = 2.00 g/mol
S: 1 x 32 = 32 g/mol
O: 4 x 15.9 = 63.6 g/mol
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           Mm = 97.6 g/mol

4.  HCl

 H: 1 x 1.0 = 1.0 g/mol
Cl: 1 x 35.4 = 35.4 g/mol
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                 Mm = 36.4 g/mol

5.  HNO3

H: 1 x 1.0 = 1.0 g/mol
N: 1 x 14.0 = 14.0 g/mol
O: 3 x 15.9 = 47.7 g/mol
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            Mm = 62.7 g/mol

6.  Na2S

Na: 2 x 22.9 = 45.8 g/mol
 S:  1 x 32.0 = 32.0 g/mol
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            Mm = 77.8 g/mol

7.  CH4

C: 1 x 12.0 = 12.0 g/mol
H: 4 x 1.0 = 4.0 g/mol
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          Mm = 16 g/mol