Number p, n and e, exercise 2 (st-11) Calculate the number of protons, neutrons and electrons. 7·H2O, with the following compositions: 3H and 15O 3·C6H12O6, with the following compositions: 2H, 16O, 13C

  Exercise: st-11    

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Calculate the number of protons, neutrons and electrons.

1. 7·H₂O, with the following compositions: ³H and ¹⁵O
2. 3·C₆H₁₂O₆, with the following compositions: ²H, ¹⁶O, ¹³C

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Solution:

1. Per ³H: 1p, 1e^–, 2n, ¹⁵O: 8p, 8e^–, 7n
       1·H₂O thus 10p, 10e^–, 11n
       7·H₂O: 70p, 70e^–, 77n
2. Per per ¹³C: 6p, 6e^–, 7n … Per ²H: 1p, 1e^–, 1n, … Per ¹⁶O: 8p, 8e^–, 8n,
       1·C₆H₁₂O₆ hence 6·6+12·1+6·8=96p, 96e^–, 6·7+12·1+6·8=102n
       3·C₆H₁₂O₆: 288p, 288e^–, 306n

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