Which profile best describes the reaction C(s) + 2H2(g) → CH4(g),
AH = -74.9 kJ?

How will the emission of an alpha particle affect the atomic number of an atom

What is the mass of 2.00 l of an intravenous glucose solution with a density of 1.15 g/ml?

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.