A student ran the following reaction in the laboratory at 1100 K: 2SO2(g) O2(g) 2SO3(g) When he introduced SO2(g) and O2(g) into a 1.00 L evacuated container, so that the initial partial pressure of SO2 was 3.43 atm and the initial partial pressure of O2 was 1.61 atm, he found that the equilibrium partial pressure of O2 was 0.809 atm. Calculate the equilibrium constant, Kp, she obtained for this reaction.

The correct answer would be 1. precipitation

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.