PLEASE HELP!!! Consider the following acid/base reaction CO2−3 + 2 H+ → H2O + CO2 that produces CO2 gas. 7.8 L of CO2 is
collected at STP. What is the molarity of the HCl solution used in the reaction if 123 mL of HCl was needed?
Answer in units of M.

Two nitro no2 groups are chemically bonded to a patch of surface. they can't move to another location on the surface, but they can rotate (see sketch at right). it turns out that the amount of rotational kinetic energy each no2 group can have is required to be a multiple of ε, where =ε×1.010−24 j. in other words, each no2 group could have ε of rotational kinetic energy, or 2ε, or 3ε, and so forth — but it cannot have just any old amount of rotational kinetic energy. suppose the total rotational kinetic energy in this system is initially known to be 32ε. then, some heat is removed from the system, and the total rotational kinetic energy falls to 18ε. calculate the change in entropy. round your answer to 3 significant digits, and be sure it has the correct unit symbol.

What type of reaction is shown below? check all that apply. 2h2o2 → 2h2o + o2 synthesis decomposition combustion

Calculate the number of moles of ethane in 100 grams