Each alka-seltzer tablet contains 324 mg of aspirin. Three alka-seltzer tablet contains (3 x 324)mg= 972 mg of aspirin= 0.972 g of aspirin.
Molecular formula of aspirin is C₉H₈O₄. Molar mass of aspirin is (9 x 12)+(8 x 1)+(4 x 16) g/ mol= 180 g/mol.
180 g of aspirin contains 1 mole of aspirin molecules i.e, 6.023 X 10²³ number of aspirin molecules. So, three alka-seltzer tablet that is 0.972 g of aspirin contains (0.972 X 6.023 X 10²³)/180 =3.25 X 10²¹ number of aspirin molecules.
Nitrous oxide .
The Lewis dot structure is attached
(4.184 J/g·°C) x (1000 g) x (28.0 - 12.0)°C = 66944 J required
(66944 J) / ((333 J/g) + ((4.184 J/g·°C) x (12.0 - 0)°C)) = 175 g ice
Explanations:- The shape of the molecule depends on bonding groups and lone pair of electrons present in the central atom. We do the sum of these bonding groups and lone pair of electrons for the shape of the molecule. The presence of lone pair of electrons affects the shape (molecular geometry) of the molecule.
For example, methane is tetrahedral as four hydrogen atoms are bonded to carbon and there is no lone pair of electrons present on C. Here, the sum of bonding groups and lone pairs is 4.
On the other hands, in water, two H atoms are bonded to the central oxygen atom and also there are two lone pair of electrons present on oxygen atom. The sum is also 4 here but the molecular geometry is bent. The difference in geometries of these two molecules is because of the repulsion between the two lone pairs present on oxygen atom.
If we take an example of boron hydride then three H atoms are bonded to B and there is no lone pair of electrons present on B. The sum is 3 and so it's shape is trigonal planar.
So, the number of bonded atoms as well as the number of lone pairs present on the central atom decides the shape of the molecule.
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Answer: the electrons remain around the atomic nuclei due to the existence of a positive charge on the nuclei that, of course, atract the negative charged electrons. The protons are the paricles in the nuclei that hold the positive charge.
Justification:
First, I wish to explaing the sense of the question. The question arises because given that the electrons have negative electric charge how is that they do not repeal each other to the point that they end leaving the nucleous of the atom alone.
This is you know that equal charges repel each other, so how is it that the electrons stand around the nucleous instead of separateing and levaing the atomic nucleous alone.
The answer is due to the existence of a positive charge on the nuclei that, of course, atract the negative charged electrons. That positive charge is the protons.
The protons are particles in the atomic nuclei that are positive charged and they exert the right attractive force upon the electrons to permit them stay in the orbitals (regions of the space around the nuclei of the atoms where the electrons are found).
