What is the molecular mass of sulfur dioxide if 300.0 cm of the gas has a mass of 0.855 g at
STP?

Express the following number in scientific notation. 0.026890 =

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?

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.