Answer:
Explanation:
Explanation: NA,Avogadro's number specifies 6.0221×1023 individual particles. It is simply another collective number like a dozen, or a score, or a gross. NA has the property that 6.0221×1023 individual cobalt atoms has a mass of 58.93⋅g
Explanation:
E maybe i am not sure or C
A molecule is polar when there is a disparity in electronegativity among its constitutive atoms and a geometric asymmetry in the distribution of charge density. A chemical bond’s polarity depends on the difference in the electronegativity between the bonded atoms; the greater the difference, the greater the electric dipole moment, and the greater the ionic character of the bond.
Because metals are generally electropositive and nonmetals electronegative, a metal cation and a nonmetal anion would form a very polarized bond. An ionic compound, by definition, consists of atoms held together by a bond of sufficiently significant ionic character. In this question, since you have a single cation and a single anion, there are no nonbonding electrons to distort the otherwise “linear” geometry of the binary electrovalent compound.
This question is rather malformed, however, which is why “linear” is in quotation marks. That is because electrically neutral ionic compounds do not properly exist as discrete entities, but rather as clusters of cations and anions arranged within a crystal lattice. “Molecule” is a term preferentially reserved for chemical species that contain covalent bonds. While molecules themselves can exist as ions, these ions are generally composed of atoms whose intramolecular bonding is covalent.
Likewise, molecular geometry as predicted by VSEPR theory contemplates a central atom bonded to at least two atomic ligands as well as nonbonding electrons, if any. The theory thus cannot be properly applied to a compound composed only of two oppositely charged ions since such a compound has neither a central atom nor nonbonding electrons.
All that said, of the answer choices you’re given, choice D would seem to be the most sensible answer.
a) The complete balanced
chemical equation is:
Zn(s) + H2SO4(aq)
--------> ZnSO4(aq) + H2 (g)
<span>b) First we find the amount zinc that has reacted based
on the given H2 produced.</span>
From stoichiometry 1 moles
of Zn is needed for every 1 moles of H2 produced, therefore:
moles(Zn) = moles(H2)
where moles is the ratio
of mass and molar mass (MM)
mass(Zn) / MM(Zn) = mass(H2) / MM(H2)
mass(Zn) = [mass(H2) / MM(H2)] * MM(Zn)
mass(Zn) = [(0.0764 g)/(2 g/mol)] * 65.38 g/mol
mass(Zn) = 2.49 g
So we got 2.49 g pure zinc in the sample so
the purity of zinc is therefore:
purity = (2.49 / 3.86) * 100 % = 64.50 %
<span>c) In part (b) what we need to assume is that in the
impurities in the sample do not react with sulfuric acid to produce hydrogen.
So that the hydrogen is only from the reaction of Zn and sulphuric acid.</span>
Answer: physical please let me know if its wrong !
