Answer:
Molar mass→ 0.930 g / 6.45×10⁻³ mol = 144.15 g/mol
Explanation:
Let's apply the formula for freezing point depression:
ΔT = Kf . m
ΔT = 74.2°C - 73.4°C → 0.8°C
Difference between the freezing T° of pure solvent and freezing T° of solution
Kf = Cryoscopic constant → 5.5°C/m
So, if we replace in the formula
ΔT = Kf . m → ΔT / Kf = m
0.8°C / 5.5 m/°C = m → 0.0516 mol/kg
These are the moles in 1 kg of solvent so let's find out the moles in our mass of solvent which is 0.125 kg
0.0516 mol/kg . 0.125 kg = 6.45×10⁻³ moles. Now we can determine the molar mass:
Molar mass (mol/kg) → 0.930 g / 6.45×10⁻³ mol = 144.15 g/mol
Out of those ones, im sure its c. It's definitely not b or d. It allows motion but also protects vital organs. :)
Answer:
C) 5 moles of Argon (Ar)
Explanation:
5mol Na x 22.990g Na/ 1 mol Na = 114.95g Na
5mol P x 30.974g P/ 1 mol P = 154.87g P
5mol Ar x 39.948g Ar/ 1 mol Ar = 199.74g Ar
Therefore Ar has the greatesr mass.
Answer:
Fungi are a food source for animals and humans. This point do not apply on fungi.
Explanation:
Roles of fungi:
Penicillin and Cephalosporins are the antibiotics made by fungi. They are natural sources of antibiotics.
Fungi are eaten by animals examples are mushroom, agaricus and some animals even eat poisonous mushrooms.
Fungi destroy by releasing chemicals into the rock and they get iron this way and then deeply burrow the rocks and harming them.
Fungi acts as a decomposer to nourish the soil and improves vegetation.
Many infections are caused by fungus like ringworm infection, candida and Athlete's food are some examples.
