What other forms of radiation may come from the stars?
1 answer:
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Q1)
formal charges for atoms are assigned, this charge can be calculated using the following formula;
f.c = number of valence electrons - non bonding electrons around the atom - number of bonds
3 structures have been given, lets calculate for each structure
A.
charges for the atoms
H = 1-0-1=0
C = 4 -4-2 = -2
N = 5 - 0-4 = 1
O = 6 - 2 - 3 = 1
B.
H = 1-0-1 = 0
C = 4 - 0 - 4 =0
N = 5 - 0 - 4 = 1
O = 6 - 6 - 1 = -1
C.
H = 1-0-1 = 0
C = 4 - 2 - 3 = -1
N = 5 - 0 - 4 = 1
O = 6 - 4 - 2 = 0
Q2)
next we need to see which structure is most favoured.
the structure with least number of atoms that have a charge.
structure B and C have 2 atoms with charges whereas A has three atoms with charges, including an atom with -2 charge which is not common. so structure A can be disregarded.
another rule is that the more electronegative atom should have the more negative charge than less electronegative atoms. In structure C, Carbon the less electronegative atom compared to N and O, has -1 value and its more negative than the charges on N and O.
structure B on the other hand, O the more electronegative atom has -1 charge and C has 0 charge. Therefore the more favoured structure is B.
formal charges for atoms are assigned, this charge can be calculated using the following formula;
f.c = number of valence electrons - non bonding electrons around the atom - number of bonds
3 structures have been given, lets calculate for each structure
A.
charges for the atoms
H = 1-0-1=0
C = 4 -4-2 = -2
N = 5 - 0-4 = 1
O = 6 - 2 - 3 = 1
B.
H = 1-0-1 = 0
C = 4 - 0 - 4 =0
N = 5 - 0 - 4 = 1
O = 6 - 6 - 1 = -1
C.
H = 1-0-1 = 0
C = 4 - 2 - 3 = -1
N = 5 - 0 - 4 = 1
O = 6 - 4 - 2 = 0
Q2)
next we need to see which structure is most favoured.
the structure with least number of atoms that have a charge.
structure B and C have 2 atoms with charges whereas A has three atoms with charges, including an atom with -2 charge which is not common. so structure A can be disregarded.
another rule is that the more electronegative atom should have the more negative charge than less electronegative atoms. In structure C, Carbon the less electronegative atom compared to N and O, has -1 value and its more negative than the charges on N and O.
structure B on the other hand, O the more electronegative atom has -1 charge and C has 0 charge. Therefore the more favoured structure is B.
Answer:
437.5 kg of first solution and 812.5 kg of second solution should be mixed to get desired solution.
Explanation:
Let the mass of the first solution be x and second solution be y.
Amount solution required = 1250 kg
x + y = 1250 kg....[1]
Percentage of ethanol in required solution = 12% of 1250 kg
Percentage of ethanol in solution-1 = 5% of x
Percentage of ethanol in required solution = 25% of y
5% of x + 25% of y =12% of 1250 kg
x + 5y = 3000 kg...[2]
Solving [1] and [2] we :
x = 437.5 kg , y = 812.5 kg
437.5 kg of first solution and 812.5 kg of second solution should be mixed to get desired solution.