3. Which of the following statements is true about the molecule shown below? O A. The bonds are polar and the molecule is polar.
O B. The bonds are polar and the molecule is nonpolar.
O C. The bonds are nonpolar and the molecule is polar
O D. The bonds are nonpolar and the molecule is nonpolar

Ineed ! i have no clue how to do this problem.

Acalorimeter is to be calibrated: 51.203 g of water at 55.2 degree c is added to a calorimeter containing 49.783 g of water at 23.5c. after stirring and waiting for the system to equilibrate, the final temperature reached is 37.6 degree c. specific heat capacity of water (s = 4.18 j/g∙degree c). calculate the calorimeter constant. (smδt)warm water = -[(smδt)cold water + (calorimeterδtcold water)]

The activation energy for the reaction no2(g)+co2(g)⟶no(g)+co(g) is ea = 300 kj/mol and the change in enthalpy for the reaction is δh = -100 kj/mol . what is the activation energy for the reverse reaction?