Calculate the percentage of nitrogen in the two important nitrogen fertilizers, ammonia (NH3) and urea (Co(NH2)2).

If blood contains 150g of hemoglobin per liter of blood, how much hemoglobin would be contained in 10 ml of blood

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?

6) (a) calculate the absorbance of the solution if its concentration is 0.0278 m and its molar extinction coefficient is 35.9 l/(mol cm). the depth of the cell is 5 mm. (b) what is the %t? (7) calculate the absorbance of the solution if the transmitted light intensity is 70% of the initial light beam intensity