NH₃ + H₂O ⇄ NH₄⁺ + OH⁻
c=9,50*10⁻² mol/L
Ammonia solution is a weak electrolyte.
The dissociation constant of ammonium hydroxide is:
K=1.78*10⁻⁵
[OH⁻]=√(Kc)
pH=14-pOH=14+lg[OH]⁻
pH=14+lg(√(Kc))
pH=14+lg(√(1.78*10⁻⁵*9.50*10⁻²))=8.23
pH=8.23
How many inches are in 450 cm?
0.393701 in = 1 cm
0.393701 × 450 = <span>177.16545
450 cm = </span><span>177.16545 in</span>
<h3><u>Answer;</u></h3>
Passive transport
<h3><u>Explanation;</u></h3>
- The movement of materials across the cell membrane without using cellular energy is called passive transport. On the other hand the energy-requiring movement of molecules across a membrane from a region of lower concentration to a region of higher concentration is called the active transport.
- It includes processes such as osmosis. diffusion and facilitated diffusion.
- Diffusion is the movement of dissolved molecules in a fluid or gas from a region of higher concentration to a region of lower concentration.
- Osmosis is the diffusion of water molecules across a semipermeable membrane from an area of higher water concentration to an area of lower water concentration.
- Facilitated diffusion is a type of diffusion of molecules assisted by protein channels that pierce a cell membrane.
Assuming that STP = 0°C, and 1 atm pressure:
molar volume is 22.414 L = 22 414 cm^3
75 mL = 1*75/22 414 moles = 0.0033461 moles.
mole mass = 39.9 g --->
0.0033461 moles = 0.0033461*39.9 g = 0.13351 g <--- ans.
A basic building block of everything that has mass
