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SHOW DOWN – Weighted Averages

SHOW DOWN – Weighted Averages. What is the atomic mass of hafnium if, out of every 100 atoms, 5 have a mass of 176 amu , 19 have a mass of 177 amu , 27 have a mass of 178 amu , 14 have a mass of 179amu, and 35 have a mass of 180.0amu?.

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SHOW DOWN – Weighted Averages

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  1. SHOW DOWN – Weighted Averages

  2. What is the atomic mass of hafnium if, out of every 100 atoms, 5 have a mass of 176 amu, 19 have a mass of 177 amu, 27 have a mass of 178 amu, 14 have a mass of 179amu, and 35 have a mass of 180.0amu?

  3. Hydrogen is 99% 1H, 0.8% 2H, and 0.2% 3H. Calculate its average atomic mass.

  4. The average atomic mass of copper is 63.55 amu. If the only two isotopes of copper have masses of 62.94 amu and 64.93 amu, what are the percentages of each?

  5. Naturally occurring silicon consists of three isotopes, 28Si, 29Si, and 30Si, whose atomic masses are 27.9769, 28.9865, and 29.9838, respectively. The most abundant isotope is 28Si, which accounts for 92.23% of naturally occurring silicon. Given that the observed atomic mass of silicon is 28.0855, calculate the percentages of 29Si and 30Si in nature.

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