Why are there so many capillaries in the lungs?

How many oxygen atoms are there in the compound Cu (NO3) 2?

Naturally occurring iron contains: 5.82% 54Fe (atomic mass = 53.940 amu) 91.66 % 56Fe (atomic mass = 55.935 amu) 2.19% 57Fe (atomic mass = 56.935 amu) 0.33% 58Fe (atomic mass = 57.933 amu) Calculate the average atomic mass of iron.

A buffer is prepared by adding 139 mL of 0.39 M NH3 to 169 mL of 0.19 M NH4NO3. What is the pH of the final solution? (Assume the value of Kw is 1.0 ✕ 10-14. Enter an unrounded value.)

If you grew a plant with labeled atoms of carbon, nitrogen, hydrogen, and oxygen, which of these sources would dominate the mass of the plant? see section 36.1 (page 749).

w Available Hint (s) Check all that apply. When a solid is converted to a liquid, heat is absorbed. When heat is applied to a solid, the molecular motion decreases as the temperature increases.

Type in the correct number for each question in the text box provided. Consider the synthesis of one molecule of glucose.

The production of ammonia (NH3) is exothermic and is in equilibrium with its breakdown (which is endothermic): N₂ + 3H₂ ⇋ 2NH₃ If the concentration of H2 is decreased, will the equilibrium shift to produce more or less ammonia? Justify your answer.

Modern scientists use a version of the metric system called

How many protons does an atom of Iodine (I), #53, have if it has an atomic mass of 127?

Which pH range is more acidic than most freshwater lakes, streams, and ponds? A. 3 to 5 B. 6 to 8 C. 10 to 12 D. 12 to 14