Atomic mass Hg = 200.59 u.m.a
200.59 g --------------- 6.02x10²³ atoms
( mass Hg ) ----------- 1.20 x10²² atoms
mass Hg = ( 1.20x10²² ) x 200.59 / 6.02x10²³
mass Hg = 2.407x10²⁴ / 6.02x10²³
= 3.998 g of Hg
hope this helps!
The presence of hydrogen and hydroxyl ions determines the acidic and basic nature of a solution.
<h3>What determine acidic and basic nature of a solution?</h3>
The use of the pH scale is one way of determining the acidic and basic nature of solution. If the pH of a solution is less than 7, it is considered as acidic and if the pH is 7, the solution is neutral.
While if the pH is greater than 7,the solution is basic so we can conclude that the presence of hydrogen and hydroxyl ions determines the acidic and basic nature of a solution.
Learn more about substance here: brainly.com/question/2901507
Considering the Dalton's partial pressure, the total pressure in the mixture of gases is 1.371 atm.
The pressure exerted by a particular gas in a mixture is known as its partial pressure.
So, Dalton's law states that the total pressure of a gas mixture is equal to the sum of the pressures that each gas would exert if it were alone:
= 
where n is the amount of gases in the mixture.
Dalton's partial pressure law can also be expressed in terms of the mole fraction of the gas in the mixture. So in a mixture of two or more gases, the partial pressure of gas A can be expressed as:
= 
In this case, the partial pressure of gas H₂ can be expressed as:
= 
You know:
= 0.48 atm
= 0.35
Replacing in the definition of partial pressure of gas H₂:
Solving:
= 
= 1.371 atm
In summary, the total pressure in the mixture of gases is 1.371 atm.
Learn more about partial pressure: brainly.com/question/15302032
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<h3>
Answer:</h3>
4.52 × 10^23 atoms
<h3>
Explanation:</h3>
Concept being tested: Moles and Avogadro's number
From the question we are given;
- Number of moles of Zinc = 0.750 moles
We are required to calculate the number of atoms of Zinc
- In order to answer the question, we need to know that a mole of an element contains atoms equivalent to the Avogadro's number.
- The Avogadro's number is 6.022 × 10^23.
Therefore;
1 mole of Zinc = 6.022 × 10^23 atoms
To calculate the number of atoms we need to multiply the number of moles with the Avogadro's constant.
= 0.750 moles × 6.022 × 10^23 atoms
= 4.52 × 10^23 atoms
Therefore; 0.750 moles of Zinc contains 4.52 × 10^23 atoms
