The molar mass of the compound is 68 g/mol.
<h3>What is the molar mass?</h3>
The Osmotic pressure can be obtained from the relationship;
π= iCRT
π= osmotic pressure = 28.1 mmHg or 0.037 atm
i = Vant Hoff factor = 1
C = concentration = ?
R = gas constant = 0.082 atmLK-1Mol
T = temperature = 20°c + 273 = 293 K
C = π/iRT
C = 0.037/1 * 0.082 * 293
C = 0.0015 M
Now;
Number of moles = C/V = 0.0015/100 * 10^-3
= 0.015 moles
Number of moles = mass/molar mass
Molar mass = mass/Number of moles = 0. 102 g/ 0.015 moles = 68 g/mol
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Answer:
1)
Enthalpy of combustion.
2)
4x bond energy of C - H
3)
enthalpy of formation of CH₄(g)
4)
- 4x bond energy of C - H
Explanation:
The enthalpy of reaction is the heat change during the reaction.
It can be:
a) Enthalpy of combustion : the heat change during complete burning of one mole of a substance in presence of oxygen.
b) Enthalpy of formation: the heat change during formation of one mole of a substance from its constituent elements in their native state.
c) The difference in the bond energies of reactants and products.
For:
Answer:
A substance that protects cells from the damage caused by free radicals (unstable molecules made by the process of oxidation during normal metabolism). Free radicals may play a part in cancer, heart disease, stroke, and other diseases of aging.
When NaF dissolve in water, it completely dissociates into Na⁺ and F⁻. The sodium ion that is Na⁺ do not react with water while the fluoride ion reacts with water and form hydrogen fluoride and hydroxide ion.
That can be shown in the reaction:
F⁻ + H₂O--->HF + OH⁻
Also using thumb rule it can be predicted that when salt containing anion of weak acid and cation of strong base, dissolve in water, basic solution is produced.