When a gas is burned, it releases 5265.2 cal of heat and does 784.91 cal of work. what is the change in energy, in kJ, for the gas?

Ithink d hope that

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.

Cis the answer to your question

Issa b bc when you in the air it gets cooler ghee