Hydrogen and oxygen react under a specific set of conditions to produce water according to the equation 2 H2(g) + O2(g) −→ 2 H2O(g). How much hydrogen would be required to produce 6.7 mol of water? Answer in units of mol.

Which of the following elements is a representative element? a. chromium (cr) b. aluminum (al) c. mercury (hg) d. silver (ag)

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.

What’s the theoretical yield of solid lead