C2H6+Cl2–>C2H5Cl+HCl

Answer:   d.  carbon dioxide.

Answer/nitrogen compounds in the soil;

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.

The answer is c.  h+  and oh−  react to form water (h2o). i just took the test and i got it right. hope this !