C. 0.1 M HCl
Explanation:
The solution with the lowest molarity is the most dilute of all.
This is why the choice is 0.1M of HCl.
Molarity is the same as concentration. The unit "M" denotes mole per liter volume of solution.
- Molarity is defined as the number of moles of solute in a give volume of solution.
- 0.1M means 0.1mole of HCl is dissolved in 1liter of solvent.
- The higher the number of moles dissolved and the more the concentration of the solution will be.
The order of increasing concentration is:
0.1M < 0.2M< 0.3M < 0.4M
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Answer:
Explanation:
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The answer is going to be d
The chemical reaction would be written as follows:
2Al + 3Cl2 = 2AlCl3
We are given the amount of aluminum to be used in the reaction. This will be the starting point of the calculations. We do as follows:
19.0 g Al ( 1 mol / 29.98 g ) ( 2 mol AlCl3 / 2 mol Al ) = 0.63 mol AlCl3
Answer:
Gallium-72
Explanation:
The elements are identified by the number of protons of the atom, which is its atomic number.
In this case the number of protons 39 (atomic number 39) permit you to identify the element as gallium.
Now, to identify the isotope you tell the name of the element and add the mass number.
The mass number is the sum of the protons and the neutrons
In this case, the number of neutrons is the original 39 plus the 2 added suddenly, i.e. 39 + 2 = 41, so the mass number is 31 + 41 = 72
Therefore, the isotope is gallium - 72.
