How many valence electrons will an atom of iron atomic number 26 have? explain why this is.
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there are two electrons in 1s
two electrons in 2s
six electrons in 2p
two electrons in 3s
six electrons in 3p
eight electrons in 3d
valence electron is 3 so 3s3p3d = 2+6+8
=16 electrons in valence shell
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NAME THESE ALCOHOLS. CH3CH2CH2CH2OH AND CH3CH(OH)CH3
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The amount of magnesium nitrate are formed from the 5.5 moles of the nitric acid in grams are 407.8 g.
The reaction is as :
2HNO₃ + Mg(OH)₂ ----> Mg(NO₃)₂ + 2H₂O
The number of moles of nitric acid = 5.5 moles
2 moles of the nitric acid = 1 mole of the magnesium nitrate
The number of moles of nitric acid = 5.5 / 2 mol
The number of moles of nitric acid = 2.75 mol
The grams of the magnesium nitrate = moles × molar mass
The grams of the magnesium nitrate = 2.75 mol × 148.3 g/mol
The grams of the magnesium nitrate = 407.8 g
Therefore, the mass of the magnesium nitrate is 407.8 g.
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happy to show my working out if you want/ need :)
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oxygen is the answer
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Answer:
Moles of Carbon in the product = 0.183 mol
Explanation:
Complete combustion of an organic compound in the presence of excess oxygen will give carbon dioxide (CO2) and water vapour(H2O).
Equation of reaction
CxHyOz(s) + (2x + y/2 - z)/2 O2(g) --> x CO2(g) + y/2 H2O(l)
Moles of products
CO2
Molar mass of CO2 = 12 + (16*2)
= 44 g/mol
n(CO2) = 8.07/44.0
= 0.183 mol
One compound of CO2 has 1 Carbon atom and 2 Oxygen atom.
So if we have,
0.183 moles of carbon dioxide then
0.183 moles of carbon.
The mass of carbon in the product, m = 0.183*12
= 2.20 g
H2O:
Molar mass of H2O = (1*2) + 16
= 18 g/mol
Number of moles of H2O =
= 3.3/18
= 0.183 mol
One compound of H2O has 2 Hydrogen atom and 1 Oxygen atom.
0.183 moles of water then we also have
= 2*(0.183)
= 0.367 moles of hydrogen in the sample.
The mass of hydrogen in the compound, m
= 0.367*1
= 0.367 g
Adding these two values together will give us the mass of our compound that C and H;
2.2 + 0.367
= 2.567 g
So for the Oxygen,
5.5 g - 2.567
= 2.933 g
Moles of Oxygen;
Molar mass of O = 16 g/mol
= 2.933/16
= 0.183 mol
There are 0.030 moles of carbon in the original sample as per the mole concept.
Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
It is given by the formula,
The given values are,mass=
molar mass=
Substitution of values in formula gives,
Thus, there are 0.030 moles of carbon in the original sample as per the mole concept.
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B. The electrons in the atom orbit around the protons.
C. The electrons are embedded in a positive sphere.
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As we know that was a wrong model and nowadays the electrons are considered to be around the nucleus, in regions called orbitals.
B...radiation
C...unstable nuclei
D...radioisotopes
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Becquerel made a conclusion that it was the uranium that causes the images found in the photographic plates. Though his theory was disproved during the first time,he continued to develop it. Then, it is through this experiment that Becquerel discovered radioactivity.
Answer:
a on edge 2021
Explanation: