Answer:
1.70
Explanation:
The molar mass of perchloric acid is 100.46 g/mol. The moles corresponding to 484 mg (0.484 g) are:
0.484 g × (1 mol/100.46 g) = 4.82 × 10⁻³ mol
4.82 × 10⁻³ moles are dissolved in 240 mL (0.240 L) of solution. The molar concentration of perchloric acid is:
4.82 × 10⁻³ mol/0.240 L = 0.0201 M
Perchloric acid is a strong monoprotic acid, that is, it dissociates completely, so [H⁺] = 0.0201 M.
The pH is:
pH = -log [H⁺] = -log 0.0201 = 1.70
A physical property is an aspect of matter that can be observed or measured without changing it. A chemical property may only be observed by changing the chemical identity of a substance.
Answer:
35 mL
Explanation:
Let the amount of 75% mixture needed be A.
The amount of each solution with their respective concentration to be added together can be expressed as:
0.75A + 0.3(280)...............eqn 1
The addition of the two solution must merge with the expected concentration and this can be expressed as:
0.35(A + 280).............eqn 2
Eqn 1 must be equal to eqn 2, hence:
0.75A + 0.3(280) = 0.35(A + 280)
Solve for A.
0.75A + 84 = 0.35A + 98
0.40A = 14
A = 35
Hence, 35 mL of the 75% mixture will be needed.
Answer:
B
Explanation:
the answer will be letter B
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Pressure belts affects the climate of an area in such a way that Low pressure belt produces rain and storms and weather conditions that are unstable.
<u>Explanation:</u>
It is the movement of air that creates difference in the pressure and this is called as Pressure gradients. The patterns of pressure that exists over a period of time in an area is called as pressure belt. The pressure belt or wind belt highly depends on the temperature of an area.
Pressure belts can affect the climatic conditions of an area greatly. Air when rises it can create lower pressure and air when shrinks it can result in higher pressure. When the pressure is low then it can create a weather condition in an area which is unstable. It can create rain or storm.
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