Answer:
42.8 g was the mass of dissolved urea.
Explanation:
Boiling point elevation to solve this:
ΔT = Kb . m
where ΔT → Boiling T° of solution - Boiling T° of pure solvent
Let's replace the data given:
118.3°C - 117.8°C = 0.63°C/m . m
0.5°C / 0.63 m/°C = m → 0.793 mol/kg
Mass of solvent → 900 g → g to kg → 900 g . 1kg/1000 = 0.9 kg
Molality . kg = moles → 0.793 mol/kg . 0.9 kg = 0.714 mol
These are the moles of urea we used. Let's determine the mass dissolved.
0.714 mol . 60 g /1mol = 42.8 g
Answer:
Sand: 28°C, 27°C, 26°C
Potting soil: 33°C, 29°C, 31°C
Mixture: 29°C, 29°C, 22.5°C.
Explanation:
<span>Plants use green pigments called chlorophylls to trap light energy. The
chlorophylls give a plant its green color. Inside the cells that have
chloroplasts, the light energy is used to make a simple sugar called glucose.
The process by which plants use light energy to make glucose is called
photosynthesis.
During this process of sugar production, carbon dioxide combines with water to
form glucose and oxygen is released. Oxygen that is produced in photosynthesis
is given off as a gas. If a lot of oxygen is being given off, photosynthesis is
occurring rapidly. If little oxygen is being given off, photosynthesis is
occurring slowly. The amount of trapped light energy and the amount of carbon
dioxide available affects the rate of photosynthesis.
The purpose of adding sodium bicarbonate powder to the water increases the
amount of carbon dioxide in the water. hope this helped
This investigation can be performed with water plants grown in many parts of
the world, except regions that have permanent ice.</span>
I believe your answer is 2200000000000000. I hope this can help you :)
