Question

calculate the atomic mass of element x. 19.0% of the isotopes have a mass of 10.013 amu and 80.2% of the isotopes have a mass of 11.000. which element is x? boron (b) tungsten (w) antimony (sb) iron (fe)

Explanation:

Step1: Calcular la contribución de cada isótopo

Para el isótopo de masa \(10.013\) amu: \(0.198\times10.013\)

$$0.198\times10.013 = 1.982574$$

Para el isótopo de masa \(11.000\) amu: \(0.802\times11.000\)

$$0.802\times11.000=8.822$$

Step2: Sumar las contribuciones

$$1.982574 + 8.822=10.804574\approx10.81$$

Answer:

A. Boron (B)