Which chemicals are reactants? 0: NH₃ + 0 02
0:02 0: N2 + 0:420
A. NH3 and O2
B. O, and H2O
C. N, and H2O
D. NH3 and N2

Wagons/motorized vehicles

Answer heart of american                  live in harmony                    hillsides of orchards                    blaze of color                    backdrop of pines;

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 a. mars