Which of the following is representative of Standard Temperature and Pressure
A. 1 atm, 273 K
B. 1,000 mmHg, 273 K
C. 1 atm, 298 K.
D. 760 mmHg, 273 °C

The Standard Temperature and Pressure is 1 atm, 273 K

Explanation:

STP is Standard Temperature and Pressure

Standard Temperature is

                             0° C in Celsius or 273 K in Kelvin

Standard Pressure is

                               1 Atmosphere (atm)

                               760 Torricelli's (torr)

                               760 Millimeters of Mercury (mmHg)

                               101.325 KiloPascals (kPa)

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.