How many grams of acetylene (CH) gas occupies a volume of 2.19 L at a temperature of 52.0°C and a pressure of 1.75 atm?

Compound with sulfer  is bright red 

Answer(28.02g/mol);

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.