1. The calculated density of the sample is 12.6 g/cm³
2. The sample is silver (option B)
<h3>Definition of density </h3>
The density of an object is defined as the mass of the object per unit volume of the object. Mathematically is expressed as:
Density = mass / volume
<h3>1. How to determine the density </h3>
- Mass = 15.12 g
- Volume = 1.20 cm³
- Density =?
Density = mass / volume
Density = 15.12 / 1.20
Density = 12.6 g/cm³
<h3>2. How to determine the sample </h3>
- Density of copper = 8.95 g/cm³
- Density of silver = 12.59 g/cm³
- Density of gold = 19.32 g/cm³
- Calculate density = 12.6 g/cm³
- Sample =?
From the above we can see that the calculated density is the approximate density of silver.
Therefore, the sample is silver
Learn more about density:
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Answer : The pH of 0.289 M solution of lithium acetate at 
is 9.1
Explanation :
First we have to calculate the value of 
.
As we know that,
where,
= dissociation constant of an acid = 
= dissociation constant of a base = ?
= dissociation constant of water = 
Now put all the given values in the above expression, we get the dissociation constant of a base.
Now we have to calculate the concentration of hydroxide ion.
Formula used :
![[OH^-]=(K_b\times C)^{\frac{1}{2}}](https://tex.z-dn.net/?f=%5BOH%5E-%5D%3D%28K_b%5Ctimes%20C%29%5E%7B%5Cfrac%7B1%7D%7B2%7D%7D)
where,
C is the concentration of solution.
Now put all the given values in this formula, we get:
![[OH^-]=(5.5\times 10^{-10}\times 0.289)^{\frac{1}{2}}](https://tex.z-dn.net/?f=%5BOH%5E-%5D%3D%285.5%5Ctimes%2010%5E%7B-10%7D%5Ctimes%200.289%29%5E%7B%5Cfrac%7B1%7D%7B2%7D%7D)
![[OH^-]=1.3\times 10^{-5}M](https://tex.z-dn.net/?f=%5BOH%5E-%5D%3D1.3%5Ctimes%2010%5E%7B-5%7DM)
Now we have to calculate the pOH.
![pOH=-\log [OH^-]](https://tex.z-dn.net/?f=pOH%3D-%5Clog%20%5BOH%5E-%5D)
Now we have to calculate the pH.
Therefore, the pH of 0.289 M solution of lithium acetate at is 9.1
Answer:
One can conclude that the metal is an alloy.
Explanation:
An alloy is a combination of metal that has two or more elements. Different metals are usually combined to give it more strength or make it more resistant to corrosion.
Cheers!
The question number 1 is cytoplasm
Question number 2 is to supply more oxygen to the muscles
