A solution is prepared by mixing 37.2 ml of 1- propanol (C 3 H 8 O) , d=0.803 g/mL MW= 0.11 g/mol) with 169.40 of water (d = 0.998g / m * L) . Calculate the mole fraction of the 1- propanol ; assume the volumes add on mixing

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Nonmetals usually react by gaining electrons

Oxygen= 88ghydrogen= 12g

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.