Question

Permanent & Variable Atmospheric Gases Percent of Atmosphere (0% H,O) 78% 21% 1% Percent of Atmosphere (1% H,O) 77% Percent of Atmosphere 12% H,O) 76% 21% 1% 2% Percent of Atmosphere (3% H,O) 76% 20% 1% 3% Percent of Atmosphere (4% H,0) 75% 20% 1% 4% 21% 1% 1% TABLE 1-2 3. According to Table 1-2. W ording to Table 1-2, what happens to the percentage of nitrogen and oxygen in the atmosphere as the percentage of water vapor increases An atom's "atomic mass number" is the number of protons and neutrons within its nucleus. For example, he most common form of nitrogen has an atomic mass number of 14 because it has 7 protons and 7 neutrons within its nucleus (7 + 7-14). The most common form of oxygen has an atomic mass number of 16 because it has 8 protons and 8 neutrons within its nucleus (8 + 8 = 16). The mass of any electron is so small that it is not factored into determining an atom's atomic mass number. A subscript is the little number to the lower right of each letter. Subscripts tell us how many atoms of a particular element are present in a molecule. For example, when you breathe in oxygen (O), you are actually inhaling oxygen molecules (0.), and each oxygen molecule is composed of two atoms. When you breathe in nitrogen (N), you are actually inhaling nitrogen molecules (N.), and each nitrogen molecule is composed of two atoms. Because a single oxygen atom (O) has an atomic mass number of 16, a single oxygen molecule (0) has a molecular mass of 32 (16+ 16 = 32). Similarly, because a single nitrogen atom (N) has an atomic mass number of 14, a single nitrogen molecule (N.) has a molecular mass of 28 (14 + 14 = 28).

Answer 1

Atomic mass of water vapor is 18 while that of oxygen is 32 and nitrogen is 28. The water vapor is relatively light compared to oxygen and nitrogen. When the amount of water vapor increase in the air, the mount of nitrogen and oxygen decrease per unit volume. As density is directly proportional to mass, thus density decreases as mass decreases. At a constant temperature, as the amount of water vapor increases, the density of air decreases.