We determined in class that each distinct molecular motion contributes 1/2R to the constant volume heat capacity of that substance (Cv). What is the expected heat capacity of CO2, a linear triatomic gas at room temperature in J/mole

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.

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Ive had this before. your answer would be d. hope this ya