Consider the following reaction 2Mg(s) + 02 (9) 2Mgo (s)
If 21.2 kcals of energy is released by this reaction, how many kJ
of energy does the reaction release? (1 cal = 4.184 J) (Round off
decimal to nearest tenths)

On a cold day, when the air temperature is 0°c, you empty your lungs and take a deep breath, filling your lungs with 4.2 l of air. if you hold your breath until the temperature of the air in your lungs reaches 37°c, what is the volume of the air in your lungs at that point, assuming the pressure does not change?

According to social exchange theory, altruistic behaviors benefit the individual who performs them.

Orque can be calculated by multiplying the force (n) applied at 90? to the lever arm at a distance (m) from the pivot point (point of rotation), the compound si unit for the torque is n? m. if the force (at 90? to the lever arm) applied is 15 n and it is applied at 2.0 m from the pivot point (point of rotation), what is the torque on the lever?