Answer:
Reducing the volume of a contained gas by one third, while holding temperature constant, causes pressure to increase by 3.0 times.
Explanation:
- Boyle’s Law : At constant temperature, the volume of a given quantity of a gas varies inversely with its pressure.
- It is clear from the data that V ∝ 1/P.
So, for two different values of both P and V:
∴ P₁V₁ = P₂V₂.
∵ V₂ = 1/3V₁
∴ P₂ = P₁V₁/V₂ = P₁V₁/(1/3V₁) = 3P₁.
The mass number refers to the total number of protons and neutrons which can be found in the nucleus of the atom.
The correct answer is 2.73.
HF is a weak acid which partially dissociates to release H+ and F-
HF → H⁺ + F⁻
Initial 0.0050 0 0
Change -x +x +x
Equilibrium 0.0050–x +x +x
Solve by using the equilibrium expression: = [H⁺] [F⁻]/ [HF]
6 .8 x 10⁻⁴= x. x / 0.0050 –x
6 .8 x 10⁻⁴= x² /0.0050
x² = 6 .8 x 10⁻⁴ x 0.0050
x² = 3.4 x 10⁻⁶
x = 3.4 x 10⁻⁶
[H⁺] = 1.84 x 10⁻³
pH = - log [H⁺] = - log (1.84 x 10⁻³)
pH = 2.73
