How does a catalyst increase the rate of a reaction? (3 points) Group of answer choices It provides a lower activation energy for the reaction. It lowers the potential energy of the reactants. It decreases the enthalpy change of the reaction. It raises the potential energy of the products.

Calculate the number of moles of ethane in 100 grams

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.

The sum of the oxidation numbers in a neutral compound is always