Answer:
Number of moles = mass/molar mass
Explanation:
Given data:
mass of Al = 11 g
Moles = ?
Solution:
Formula:
Number of moles = mass/molar mass
Molar mass of aluminium is 27 g/mol
Now we will put the values in formula.
Number of moles = 11 g/ 27 g/mol
Number of moles = 0.41
The number of moles in 11 g Al are 0.41 mol.
Ranking of the ions in each set in order of decreasing size -
Cs+ > Ba²⁺ > Sr²⁺
Cs+ has the biggest size, because its more downward (compared to Sr2+) and more to the left (compared) ot Ba2+.
Sr2+ has the smallest size because it's more upwords (compared to Cs+ and Ba2+).
For isoelectronic ions, the greater the nuclear charge , the greater is the attraction for electrons and smaller is ionic radius. In other words, size of the isoelectronic ions decreases with increase in atomic number.
Cl3+ has the smallest ion among all.
To learn more about ions from given link
brainly.com/question/14658491
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Answer:
See Explanation
Explanation:
1) Let us recall that;
Mass number = number of protons + number of neutrons
Where;
Number of protons = ?
Number of neutrons =20
Mass number =39
Number of protons = mass number - number of neutrons
Mass of protons =39 - 20= 19 protons
2) Atomic number = 13
Number of neutrons =14
Then the mass number =13 +14 =27
The symbol of the element is 27X13
The number of protons= the number of electrons =13
The atomic number is the same as the proton number =13
The order with respect to A is 2
The order with respect to B is 0.
The overall reaction order is 2.
<u>Explanation:</u>
The rate of chemical equation is represented by its rate equation. Here the rate equation of the given chemical reaction is
![rate=k[B]^2](https://tex.z-dn.net/?f=rate%3Dk%5BB%5D%5E2)
Here k represents the rate constant .
Order of the reaction with respect to its individual reactants is represented by the power of the the reactants in the rate equation.
Here the power of the reactant A is 0 and the power of reactant B is 2.
Hence the order with respect to A is 0 and order with respect to B is 2.
The overall order of the reaction is given by the sum of the powers of the reactants in the rate equation.
Hence the total order=2+0=2
