POSSIBLE POINTS: 5 The pressure of a mixture of hydrogen, nitrogen, and oxygen is 2.60 atm. What is the partial pressure of the hydrogen in atmospheres if the partial
pressures of nitrogen and oxygen are 749 torr and 123 kPa?

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Radon-222 or rn-222 has a half-life of 3.82 days. to determine the fraction of an original sample of rn-222 that remains unchanged after 7.646 days, we calculate the amount of rn-222 remaining after 7.646 days and divide it with the original amount. using 1 gram as a basis and using half-life calculation methods, we can determine that  0.249 or 0.25  grams of rn-222 will remain, and thus the fraction remaining is 0.25 or 1/4.

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