Name two elements that have properties similar to those of beryllium and have average atomic masses higher than 130
1 answer:
In the periodic table, elements of the same group are characterized by having the same similar properties.
So, first we will check the elements that lie within the same group as <span>beryllium and then we will attempt to choose the elements with atomic mass higher than 130.
So, elements in the same group as </span>beryllium are: magnesium, calcium, strontium, barium and radium.
Among these elements, we will find that:
radium has atomic mass of 226 amu
barium has atomic mass of 137.327 amu
Based on this, the two elements would be barium and radium.
So, first we will check the elements that lie within the same group as <span>beryllium and then we will attempt to choose the elements with atomic mass higher than 130.
So, elements in the same group as </span>beryllium are: magnesium, calcium, strontium, barium and radium.
Among these elements, we will find that:
radium has atomic mass of 226 amu
barium has atomic mass of 137.327 amu
Based on this, the two elements would be barium and radium.
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Answer:
The molarity of the diluted solution is 1.786 M
Explanation:
Dilution is a process in which you always start with a concentrated solution to which a greater volume of solvent is added. This modifies the concentration and volume of the resulting solution, but the amount of solute used to prepare the initial solution remains the same.
In summary, in a dilution the amount of solute does not vary, but the volume of the solvent varies: when more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.
The following rule is fulfilled:
Vinicial x Cinicial = Vfinal x Cfinal
where:
- Vinicial = Initial volume.
- Cinicial = Initial concentration
- Vfinal = Final volume
- Cfinal = Final concentration
In this case:
- Vinicial= 250 mL= 0.25 L (Being 1 L=1000 mL)
- Cinicial= 12.5 M
- Vfinal= 1.5 L+ 0.25 L=1.75 L
- Cfinal= ?
Replacing:
0.25 L* 12.5 M= 1.75 L* Cfinal
Solving:
Cfinal= 1.786 M
<u><em>The molarity of the diluted solution is 1.786 M</em></u>