Calculate the length in km of a row containing 1 mole of hydrogen atoms laid side to side if diameter of a hydrogen atom =.212 nm?
A basement of 14-m by 10-m by 3.0-m had a high randon content. On the day the basement was sealed off from its surroundings so that no exchange of air could take place, the partial pressure of 222Rn was observed 1.2 x 10-6 mmHg. compute the number of 222Rn isotopes (t1/2 = 3.8 d) at the start and end of 31 days.