+ 329 1315 At
2.
Calculate the heat of reaction for the following process:
3 FeCl2 → Fe + 2 FeCl3,
given the following info:
Fe + 2HCl → FeCl2 + H2H
2 Fe + 6 HCI → 2 FeCl3 + 3 H2
1822
AH = -769 kJ
AH = 41822 kJ
3. Calculate the heat of reaction for the following reaction:
Fe + 2 Agri → 2 A Coru

It idk haha what are we doing?

Do you have any options?

D=m/v =57.9/3 = 19.3 g/cm^3

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.