Answer:
molar mass of methane CH4
= C + 4 H
= 12.0 + 4 x 1.008
= 12.0 + 4.032
= 16.042g/mol
7.31 x 10^25 molecules x 1 mole CH4 = 121.43 moles
6.02 x 10^23 CH4 molecules
121.43 moles CH4 are present.
Explanation:
not to certain if this is right or not.. but hope it helps!
Answer: > > >
Explanation:
Isoelectronic specie are defined as the molecules which have the same number of electrons.
Atomic number of calcium is 20 and thus has 20 electrons. is formed by loss of 2 electrons and thus has 18 electrons.
Atomic number of potassium is 19 and thus has 19 electrons. is formed by loss of 1 electron and thus has 18 electrons.
Atomic number of chlorine is 17 and thus has 17 electrons. is formed by gain of 1 electron and thus has 18 electrons.
Atomic number of phosphorous is 15 and thus has 13 electrons. is formed by gain of 3 electrons and thus has 18 electrons.
As the number of electrons are same , the more is the nuclear charge i.e. the number of protons , more will the force of attraction towards the nuclei and thus smaller will be the radii and vice versa.
Thus, order of decreasing ionic radii for the given ions is as follows.
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Answer:
Tetrahedral
Bent
Explanation:
A molecule in sp3 hybridization is ordinarily expected to exhibit tetrahedral electron domain geometry. This implies that it has four electron domains.
We were specifically informed in the question that two lone pairs are present. Remember that lone pairs distort the molecular geometry away from the expected geometry based on VSEPR theory.
Therefore, the bond angle of the molecule is <<109.5 degrees and its molecular geometry is bent (e.g water)
In its ground state Calcium has a 2 valence electrons.
absorbance of compound = total absorbance - absorbance of the solvent
.399 - .052 = 0.347
Molar Absorbance
.347 / 0.0000716 M = 4846