A compound has an empirical formula C4H4S. What is its molecular formula, if its molar
mass is 168 g/mol?
(C=12.01 amu, H=1.008 amu, S=32.06 amu)

60.0 - there are 3 significant numbers

Answer (b) supersaturation;

English , i don't understand spanish.

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.